The following recipe is simpler than the preceding, but not so delicate. Cut an onion in very thin slices and put it on the fire in a saucepan with a little butter. When it is well browned add a pinch of flour, mix and then add according to the quantity, a cup or two of soup stock or water with bouillon cubes and allow the flour to cook. Put in the peas, season with salt and pepper and add, when they are half cooked, one or two whole hearts of lettuce. Let it simmer, seeing that the gravy is not too thick.
Before serving remove the lettuce.