Potage à la Bonne Femme from The Robert Carrier Cookbook by Robert Carrier

Ingredients

• 1 head lettuce, shredded
• 4-5 spring onions, thinly sliced
• 2 tablespoons butter
• 1 quart chicken stock
• 4-5 sprigs tarragon, chervil or sorrel, finely chopped
• 1 packet frozen peas
• ½ cucumber, peeled, seeded and sliced into matchsticks
• salt and freshly ground black pepper
• ¼ pint cream
• 2 egg yolks
• fried croûtons of bread