Complete the tomato soup recipe with the given verbs (cook,slice,put,serve,chop,add(2),fry,mix,heat,peel,wash) the onions and into rings. butter in a thick frying pan, the onions, and are just turning golden. the stock,salt and peper into a saucepan. and tomamtoes. the chopped tomatoes and the onions. 10 minutes. with toasts.