Marinara/Pizza Sauce

2 tablespoons olive oil
6 oz can tomato paste
20 oz can canned tomatoes (I puree these in the food processor/blender)
1 carrot, grated or 1 tsp sugar
½ tsp freshly ground pepper
1/2 T Italian seasoning
1/2 t dried basil

5 tablespoons butter
salt to taste

Heat the oil in a heavy-bottomed saucepan. Stir in the tomato paste, tomatoes, carrot, pepper, and basil. Simmer for 30 minutes.If the sauce becomes too thick, add a little water. Cook 15 minutes more, then stir in the butter and salt.