Peel__ the onions, and __slice_ into rings. _Put__ the
butter in a thick saucepan, _add___ the onions, and __fry__ until they are
just turning golden. __Heat__ the grill. __Add__ the stock, salt, papper, and
herbs and __cook __ for 10 minutes. _Grate__ the cheese. __Put__ the soup in a
casserole, sprinkle with cheese and __heat__ under the grill until the cheese has
melted. _Serve__ with toasts.