These cherry tomatoes in balsamic vinegar go nicely on hot sandwiches.
Poke each cherry tomato so it doesn't turn into a little bomb. Put in a pan over medium heat. (I think I used oil once and eschewed it once…next time I'll try a little oil again.) Squash them gently with a potato masher. The juice will squeeze out and make a little sauce, while the tomatoes cook. Finish by adding a little balsamic vinegar. The vinegar taste will ideally be kept in balance with the tomato taste.
These are delicious on grilled turkey sandwiches.