Clean and boil tripe until tender; then fry 1 chopped carrot and 1 onion until light brown. Stir in 1 tablespoonful of flour; add 1 cup of stock, 1 bay-leaf, some thyme and parsley; let boil. Season with salt, pepper and lemon-juice. Cut the tripe into narrow strips; add to the sauce. Let simmer one-half hour and serve.