Makes about 1 pint (600 ml)
30 gm butter
900 gm tomatoes - skinned, seeded and finely chopped
1/2 - 1/2 tsp sugar
salt and pepper
Melt the butter in a heavy-based saucepan over low heat. Add the tomatoes and stir to mix with the butter. Cover and cook for 5 minutes.
Uncover and stir in the sugar. Partly cover the pan and simmer gently, stirring occasionally, for 30 minutes or until the tomatoes have softened and the sauce is thick.
Season the sauce to taste with salt and pepper. Use immediately or cool and then refrigerate or freeze.
Source: The Ultimate Cooking Course & Kitchen Encyclopedia