As we speak I'm scoffing the luxury quorn lasagne from the new magazine - tastes great and well recommended.
But for my basic, quick and easy tomato sauce I do this:
In a frying plan add a tin of chopped tomatoes, splash of worcestershire sauce, splash of soy sauce, pinch of sweetener, a crumbled stock cube, and sprinkle of Schwartz Garlic Italian seasoning. Bring to boil, reduce heat and simmer. Add a touch of water if it starts to get too thick. Sauce will be ready when your pasta is done. You can also adapt it by adding chilli, soft cheese, BBQ seasoning instead of Italian, mixed beans, tuna, chicken and so on.