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The green sauce in this recipe is not the well known mediterranean salsa verde, but Grüne Sosse, a speciality of Frankfurt introduced to me by our friend Ariane, a native of the city, and a neighbour in Bonnington Square for many years. It is traditionally served with asparagus of the forced white variety, which is particularly prized in Germany, where Spargelfesten are held in its honour every spring. Although green sauce made from a variety of herbs can be found in German restaurants all year round, it is only in early spring that the truly authentic sauce can be made, when the herbs required are coming into their prime and the paper packages of them required to make it are found in farmer’s markets, together with the white asparagus which it traditionally accompanies.

Genuine Grüne Sosse requires seven specific herbs; sorrel, chervil, chives, parsley, salad burnet, cress and borage. However, it is seldom that any of us have access to all of these herbs, and so substitutions can be made. The crucial thing is to ensure a good balance of flavours, with the requisite amount of sourness, freshness, bitterness and spice. There is no hard and fast rule about how much of each herb to use, but a rule of thumb is that no one herb should make up more than 30% of the bulk. When possible I try to get a fairly even balance between all of them, but you should adjust to taste and to what is available.

From left to right: borage, wild chervil or cow parsley, salad burnet, wild onion, watercress, sorrel, parsley

Since it is so plentiful in our fields I use wild sorrel (Rumex acetosa), which I suspect is what the authentic recipe calls for, however you can replace this with the more usually grown French or garden sorrel (Rumex scutatus). If neither of these are available  you could use young chard or spinach leaves and an extra squeeze or two of lemon juice.

When it is available I use wild chervil instead of cultivated. Otherwise known as cow parsley (Anthriscus sylvestris), it is perfect to pick right now, and can be substituted for garden chervil (Anthriscus cerefolium) in salads or sauces for chicken and fish. If you are an inexperienced forager you must be extremely careful not to mistake poisonous hemlock for cow parsley. Use a good field identification guide (Miles Irving’s The Forager Handbook and Roger Phillips’ Wild Food are invaluable) and, if in doubt, do not pick it.

In place of chives I use wild onion (Allium vineale) from the fields, being careful to pick only the youngest quills, as the older ones are tough. The cress can be replaced with watercress, rocket or even nasturtium leaves, to provide the peppery note. And, from the hedgerows, I have also used the leaves of garlic mustard (Alliaria petiolata), young dandelion leaves and even nettle tops, when the other herbs are hard to come by. 

The salad burnet and borage both impart a distinctive cucumber flavour which it is not possible to replicate with other herbs and which is particular to this sauce. When unavailable I have used peeled and finely grated cucumber in their place. Salt it and squeeze the juice from it before incorporating, to prevent it diluting or curdling the sauce.

It is also possible to make up the quantities with more easily available herbs such as dill, fennel, tarragon or mint but, with their pronounced flavours, these should all be used in moderation or they will overwhelm the flavour. 

This sauce is also traditionally served with boiled new potatoes and halved hard boiled eggs, or as an accompaniment to boiled beef or poached fish.

Clockwise from top left: salad burnet, watercress, sorrel, parsley, wild onion, borage, wild chervil
Ingredients
150g mixed green herbs
250g sour cream or quark
125g yogurt
2 hard-boiled eggs
3 tablespoons lemon juice
sea salt 
7-8 spears of asparagus per person

Serves 4

Method
Wash the herbs. Put them in a salad spinner and then dry on a tea towel or paper towel. 
Remove the leaves from the stems.
Discard the stems. 

Peel the eggs and put the yolks in a mixing bowl. Coarsely chop the whites and reserve. To the egg yolks add the lemon juice, 2/3 of the herbs, 1/4 teaspoon salt and the yogurt . Liquidise using a hand blender. 

Stir the sour cream into the mixture. Add the coarsely chopped egg white. Finally add the remaining finely chopped herbs.

Season with more salt and lemon juice to taste. 

If possible allow the sauce to rest in the fridge for an hour or so for the flavours to combine. Allow to come back to room temperature before using.

Gently bend the asparagus spears until they snap. Trim the broken ends. If necessary finely peel the lower sections of the stalks of the outer fibrous layer.

Put water to a depth of 2cm into a lidded sauté pan that is wide enough to take the asparagus in a more or less single layer. Bring to the boil. Put in the asparagus and simmer until tender. For thicker or older spears this may take as long as 5-6 minutes. Fine spears and those just picked will take far less, 2-3 minutes at most. Take the asparagus from the water and spread out on a paper towel on a plate to drain and cool quickly.

Arrange the warm asparagus on plates. Spoon over some of the sauce. Decorate with reserved herb leaves. Eat with fingers.

Recipe and photographs: Huw Morgan

Although asparagus only became prized as a culinary vegetable in Britain in the 17th century it was grown, and indeed prized, by the ancients as a medicinal herb and vegetable. The Romans even froze it in the High Alps, with the Emperor Augustus creating the Asparagus Fleet to take the freshly pulled spears to be buried in the snow for later.

The tips, which are the sweetest part and known as the love tips or ‘points d’amour’, are always best when eaten fresh and, though we think nothing of seeing it on the supermarket shelves as an import, there is nothing like eating it in season, right there and then, when the energy of the new season is captured in young spears.

So it is a good feeling to have planted an asparagus bed, as they represent longevity and permanence. Plant one and it will take two to three years to yield, but established crowns can easily crop for a couple of decades if you give them the care they need; namely good drainage, plenty of sunshine and little competition at the root. The roots, which radiate out from a crown in spidery fashion, are shallow, and hoeing is not advisable, so an asparagus bed is also a commitment to hand weeding. You will have to work for your reward.

“…established crowns can easily crop for a couple of decades if you give them the care they need…”

Being a coastal plant, Asparagus officinalis is tolerant of salt, indeed tradition has it that the beds be salted to keep weeds at bay. However, I do not. In truth my bed is far from text book perfect. I have not raised it above the surrounding ground like the carefully drawn diagrams in the books, and the Californian poppies and Shirley poppies have seeded into the open, weed-free ground to become the, admittedly attractive, weeds in the patch.

I winkle the Eschscholzia out where they seed too close to the crowns, but leave a handful, as they like the same conditions and sit brightly beneath the fronds once the asparagus is allowed to grow out after cropping. The few plants that are female pepper themselves with scarlet, pea-sized fruits, which hang in suspension like beads caught in a net as the fronds fade to butter-yellow later in the season. It is a fine but unadvisable association, if playing things by the book is your thing.

Californian poppies provide interest beneath the asparagus ferns later in the season

Our first asparagus bed was planted four years ago in the original mixed vegetable and trial garden. The crowns, which are best planted bare-root in the spring, arrived by post and were carefully planted in late April. The soil was manured the previous summer and the crowns laid out on an 18” grid. The books advise two feet between rows, but our slopes are sunny and the ground hearty, so I took the risk with a closer planting.

I opened a trench and fashioned a little mound of soil for each plant to allow the roots to radiate out, down and away from the crown. The trench was then backfilled with the crown just below ground level and marked with a cane to protect the position of the first emerging spears. Over the first year the crowns gather in strength, each frond outreaching the next so that, by the end of the first summer, they are already showing their potential. It is essential to wait before cropping to allow the plants to build up their reserves. I cropped them for the first time last year, but took only a few spears to avoid weakening them. This year, there will be no need to hold back.

Asparagus officinalis ‘Connover’s Colossal’

I bought two varieties initially, both male, so I am not sure how I have females in the mix, but no matter. Male plants are more productive and so, according to the rules, the berrying females should be weeded out. ‘Connover’s Colossal’, an old 19th century variety, is a reliably strong cultivar, but ‘Stewart’s Purple’ has been disappointing. It is supposed to be higher yielding than many of the green varieties, but you only really know and understand what a plant’s habits are when you grow it for yourself and, for me, ‘Stewart’s Purple’ doesn’t cut the mustard.

A third of the plants have failed and, although the spears are a beautiful inky purple colour and deliciously sweet, even the plants that have survived have cropped very erratically. They require far too much space to waste on such a meagre harvest. Anthocyanins, which give vegetables and fruit their purple colouring, are valued as antioxidants, but I wouldn’t grow this variety again other than to possibly work it into the herb garden as an ornamental. Here, with moody fronds rising up prettily above chives and purple sage, occasional spears could be harvested and thinly sliced raw into salads.

Asparagus officinalis ‘Stewart’s Purple’

There is an associated guilt attached to my original asparagus bed, which comes from the knowledge that the bed could never have been long-term. I always knew the test garden would give way to a new ornamental garden and, over the last couple of years, I have been relocating the vegetable garden to the other side of the house. The diggers are coming in shortly to shape the land for the new garden, but the asparagus bed will remain for one more year, like a boat anchored off shore.

Last spring I planted an F1 variety called ‘Gijnlim’ in the new vegetable garden to pave the way for the hand over from the old bed to the new. Having been selected for its hybrid vigour ‘Gijnlim’ is said to crop within a year, but I am still leaving it this year to build up reserves, mulching the bed with home-made compost before the spears emerge. It won’t be easy to cut my old bed adrift when I have to later in the autumn, but for now we are enjoying the luxury of eating the spears absolutely in season, when the garden is beginning to rush with energy.

“It won’t be easy to cut my old bed adrift when I have to later in the autumn….”

When a bed is up and moving in the spring, you can visit it daily for three weeks or so of harvesting. A sharp knife inserted carefully at the base of a spear and just below ground level is the best way to pick what you need, but be careful not to damage the crown. See it as a surgical exercise and, for best and sweetest results, pick just before you eat. Steam and serve al dente and every mouthful will be worth the commitment.

If you read up about asparagus yields to try and arrive at an ideal number of plants for a bed that suits your needs you get wildly differing advice. An American website says that 24 plants produce enough for a family of four. Big portions I’m guessing, but advice closer to home advises ten to twenty plants for the same number of people. We have sixteen crowns in the new bed and hope that this will be plentiful enough to pick what we need without providing a guilt-inducing glut. I’d have liked for there to be two varieties, so that we have an early cropper and a late, but we have had to draw the line somewhere. There is only so much ground that can be committed to perennial vegetables, even one as delectable as sparrow-grass.

Words: Dan Pearson / Photographs: Huw Morgan

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