
Roasting: Preheat oven to 400 degrees F. Cut the tomatoes in half. In a baking dish combine tomatoes, onion, and basil. Cut off the top of the garlic bulbs to expose the cut cloves of garlic. PLace the bulbs in the baking dish. Drizzzle the olive oil over the garlic cloves and tomatoes. Sprinkle with salt and pepper. Bake for 20 minutes. Remove the baking dish from the oven. Squeese the garlic bulbs to release the pulp. Mix the garlic pulp with the roasted tomatoes. Place the burrata in a serving dish. Spoon the tomatoes over and around the burrata. Top with additional basil to garnish.
To serve: Cut 4 rolls in half lengthwise to give 8 pieces. Grill. Serve with the caprese. The remaining rolls can be frozen to use later.