Preheat oven to 325º F.
Slice tomatoes in half (cocktail, plum, roma, etc), place cut side up in a greased ovenproof pan.
Stir together the garlic, basil, olive oil, and optional oregano/za-atar in a small bowl.
Spoon mixture on each tomato. Sprinkle with salt and pepper.
Flavor Option: Add a sprinkle of oregano or za'atar.
Bake for 2-3 hours or more (depending on size of tomatoes and how hot your oven runs) until withered and edges are browned. The larger the tomatoes, the longer they will roast.