Although generally used raw as a salad ingredient, lettuces can also be served as a cooked vegetable, provided they are well-hearted or have crisp outer leaves. Cos lettuce is particularly good.
Lettuces can be kept for 1 - 2 days in a cool, dry vegetable rack or larder or in a polythene bag in a refrigerator.
Remove the very outside leaves of the lettuce. Trim off the root and wash the lettuce well in plenty of cold water to remove all the dirt and sand.
For 4 lettuces, melt 50 g butter or margarine in a wide pan. Add the lettuces and season with salt. Cover the pan and stew for about 30 minutes or until the lettuces are very tender. Season to taste with salt and pepper before serving.
Make each lettuce into a neat bundle by tying the loose leaf tops together with fine string. Blanch the bundles for 5 minutes in boiling salted water and drain thoroughly. Make a mirepoix (a mixture of diced vegetables, carrots, onions and celery) and add enough stock to half cover the vegetables. Bring to the boil and place the lettuce on top. Baste some of the stock over the lettuce. Cover the pan with a piece of greaseproof paper or foil and then with the lid. Cook over gentle heat for 1 1/2 hours or until the lettuce is very tender, basting with the stock from time to time. Remove the lettuce from the pan with a perforated spoon and place in a serving dish. Drain the cooking liquor into a small pan and add 1 tsp meat glaze if available. Boil the liquor rapidly until it is reduced to a thin glaze, and then pour it over the lettuce. The mirepoix can be served as a separate vegetable dish.