How to Make It
Preheat grill to high or oven to broil with oven rack 4 inches from heat. Brush cut sides of ciabatta with oil. Grill directly on grates or broil cut side up on a baking sheet until lightly charred in spots, 3 to 5 minutes.
Rub garlic all over cut sides of ciabatta. Rub tomato halves over cut sides of ciabatta, letting seeds and juice fall on top. Drizzle with more oil and season with salt and pepper.
Cut crosswise into 1-inch-thick pieces and serve.