Heat olive oil and cook onion until it softens, then set aside. Bake peppers in moderate oven for 30 minutes until they darken. Let cool, and peel off skins. Cut in half lengthwise, discard seeds, and trim into 4 pieces. Slice trimmings into strips and set aside.
Soak white bread in milk, and squeeze dry and finely chop. Mix minced beef, bread, herbs, salt and pepper in a large bowl. Ad