Gadenin日本語Get the appThe first crop of the year, and the best one
Sorrel's real value is timing. It breaks dormancy at soil temperatures around 40F (4C), which is far earlier than any sown leaf crop, and there are usable leaves in the very earliest part of spring when the rest of the garden is bare. Those first leaves are also the best of the year: thin, bright green and cleanly sharp, before the plant has any thought of flowering.
Start picking when the leaves reach about 4 inches (10 cm) long. Do not wait for them to reach full size. A leaf left to grow to 8 or 10 inches (20 to 25 cm) has a tough midrib, a coarse texture and a flavor that has gone from lemony to sour. With sorrel, small and young beats large every single time.
| Leaf length | Texture | Best use |
|---|---|---|
| 2 to 3 in (5 to 8 cm) | Very tender, thin | Raw in salad, whole |
| 4 to 6 in (10 to 15 cm) | Tender, clear flavor | The all-purpose stage: sauces, soup, eggs |
| 6 to 8 in (15 to 20 cm) | Midrib firm | Strip the midrib out, then cook |
| Over 8 in (20 cm) | Coarse and stringy | Cut off and compost; take the next flush instead |
Pick the outer leaves, leave the center
The standard method is cut-and-come-again from the outside. Take the outer leaves, which are the oldest and largest, and leave the small ones in the middle of the crown to carry on growing. Cut the stalk about an inch (2.5 cm) above the crown with snips or a knife rather than pulling, because pulling tears the crown and lets rot in at the wound.
Never take more than about a third of the leaves at one picking if you want the plant to keep producing steadily. A plant stripped bare regrows, but it takes two to three weeks and the flush is smaller. A plant picked at a third every week keeps going all season without a gap.
The exception is a deliberate hard cut. If a plant has gone coarse or has been flowering, cut everything off an inch above the crown, feed and water, and let it start again. That is a reset, not a harvest, and it is the right move once or twice a season.
- Pick in the morning Leaves cut early, while they are still full of water, stay crisp for hours. Leaves cut in afternoon heat are already limp and never fully recover, even in water.
- Cut, do not pull Snip the stalk an inch above the crown. Pulling levers the growing point and can lift a whole young plant out of the ground.
- Take a third at most Leave the small central leaves untouched. They are the engine that produces the next picking.
- Take the oldest leaves even if you do not need them Old leaves left on the plant go yellow, lie on the soil and attract slugs. Clearing them keeps the crown open and dry.
It turns khaki the moment it is cooked, and that is normal
Sorrel goes from bright green to a dull olive-khaki within about thirty seconds of hitting heat. This is not a sign that you have overcooked it or that the leaves were old. The acid in the leaf converts the chlorophyll as soon as the cell walls break down, and the color change is unavoidable. Every cook meets this once and assumes they have ruined it.
Work with it rather than against it. If you want green on the plate, use sorrel raw, shredded through a salad or scattered at the very last second. If you are cooking it, accept the khaki and let something else carry the color: sorrel melts into a puree in a couple of minutes and belongs in soups, sauces for fish, and folded through eggs, where the color matters far less than the sharpness.
The leaves also collapse dramatically. A large colander of raw sorrel cooks down to a few spoonfuls, so pick far more than looks necessary. Reckon on about ten times the volume you want at the end.
Cooking sorrel in an untinned copper, cast iron or aluminum pan can give the dish a metallic taste and a gray cast, because the leaf acid reacts with bare metal. Stainless steel or enamel avoids the problem entirely.
Eat it in moderation because of the oxalic acid
The sharp lemon flavor of sorrel comes from oxalic acid, the same compound found in rhubarb leaves and spinach. In the amounts a garden crop is normally eaten in it is not a concern, but sorrel is stronger than most leaves and it is worth being plain about it: eat it as a flavoring in reasonable helpings rather than as a bulk salad green eaten by the bowlful every day.
Anyone prone to kidney stones, or advised to limit oxalates, should be cautious with it. Cooking reduces the oxalate content somewhat, and serving sorrel with dairy, as in the classic cream sauces and soups, binds some of it as well. Older leaves contain more than young ones, which is one more reason to pick small.
None of this makes sorrel a dangerous plant. It is a long-established European kitchen crop eaten for centuries. It simply is not a lettuce substitute, and treating it as a strong seasoning leaf rather than a salad base is both safer and better cooking.
Use it fresh; it does not store
Sorrel keeps its quality for about two or three days in the fridge in a bag or a box, and that is the limit. The leaves are thin and high in water and they go slimy rather than merely wilting. Do not wash it until you are about to use it, because wet leaves collapse faster.
For longer keeping, cook first and then freeze. Melt the leaves down in a pan with a little butter until they turn khaki and collapse, cool, and freeze in small portions or an ice cube tray. That freezes well for months and drops straight into a soup or sauce. Freezing raw leaves gives you a bag of mush that is hard to portion. Drying is a waste of time: dried sorrel loses the acidity that is the whole point of it.
Note the date of your first pick each spring. It is the earliest harvest date in most gardens, and having it written down tells you how early the season is running compared with previous years.