Cook the pasta in plenty of salted water until al dente.
Heat the oil in a small saucepan and sweat the onions in it. Add the tomatoes and let the sauce simmer a little. Then stir in the granulated broth and season with paprika, curry, basil, oregano, parsley, cayenne pepper, salt and pepper and refine with a little cream if you like. Let simmer for a few more minutes.
Drain the finished spaghetti and serve with the tomato sauce.