Oysters with Slow Roasted Tomato Butter

2 lb Plum tomatoes (halved lengthwise)2 tbsp fresh thyme2 tbsp olive oil2 tsp salt2 cloves garlic (minced)8 tbsp butter (unsalted and softened)2 tbsp fresh basil (chopped)1 tbsp red wine vinegar1/2 tsp pepper24 fresh oysters Appetizer, Main...