1 medium yellow onion or shallot, diced 2 tbsp unsalted butter or olive oil 1/2 tsp ground chipotle or cayenne pepper salt and pepper, to taste 1 large can tomatoes, roughly chopped 1/2 cup half-and-half, milk, or yogurt 1-4 tbsp brown sugar, if needed handful dried or fresh basil, oregano, or parsley, if desired Heat butter or olive oil in saucepan; add chipotle/cayenne, salt and pepper and shake pan to blend spices and oil Add onions or shallots and cook over medium heat until soft, stirring occasionally Use kitchen shears to roughtly cut up tomatoes in can; add, with juices, to onion mixture and stir Let simmer a few minutes and taste Add brown sugar and more salt and pepper if needed (some tomatoes are very acidic, while others are very sweet) Remove from heat and stir in milk, half-and-half, or yogurt and herbs if available Serve in mugs with grilled cheese sandwiches