Simple! I use my slow cooker but I'm sure you can do it in a lidded casserole dish in the oven?
A full pack of small vine tomatoes ( or any) put into SC. squash a little to break skins.
A chopped garlic put in SC
A big slosh or 5 tbsp balsamic vinegar put in SC
I leave mine on low all day or half a day. In oven I'm guessing 45 mins to hour?
When ready to eat ,boil pasta,drain, throw into SC. to soak up juice. Serve and eat with a spoon or your chasing pasta. It's so so tasty.