Peel and finely chop the onions. Carve tomatoes crosswise, blanch, skin and cut into eighths. Fry onions in hot fat. Add tomatoes and stock.
Leave to boil down until creamy. Season to taste with salt and pepper. Wash the chilli pepper and cut into fine rings. Remove the seeds and add the pods to the sauce
Variation: With tabasco, herbs (rosemary), onions. With plenty of roasted minced meat and/or peppers