In a large casserole, heat oil at medium heat. Add leeks, prosciutto, carrot and celery, then fry 5 minutes. Add chopped veal and cook until it loses its pink tint. Pepper generously.
Add dry white wine, canned crushed tomatoes, parsley and sage.
Simmer at low heat for 1 hour and 30 minutes by adding 125 ml (1/2 cup) at mid-cooking.
Did you know that...
To keep leeks in the freezer for a long time, they must be clean, dry, cut and in an airtight bag or container.