Really good sauce for as simple as it is! My young daughter who doesn't usually like tomato sauce happily topped spaghetti and meatballs with this sauce.
I used diced tomatoes, added a little bit more butter, 2-3 tsp of soy sauce instead of salt, and 1 tbsp of tomato paste. The sauce looked like salsa with the finely chopped onions, so I pureed it when it was done simmering. Come to think of it, my daughter may just prefer smooth sauces.
