The soup keeps 5 days refrigerated and freezes 3 months. Freeze it before adding cream, which can split, and stir the cream in when reheating. Grilled cheese has to be made fresh.
Canned tomatoes are naturally sharp. Cream, butter, a pinch of sugar or a longer simmer all soften it. A grated carrot cooked with the onion adds sweetness without tasting sweet.
Lower heat and a lid. Grating the cheese rather than slicing it also melts far faster.
Yes. An immersion blender is easiest, but you can simmer longer and mash it — rustic rather than silky.