Split bread loaf lengthwise, and cut each half into slices about 2 to 3 inches across. Prepare a gas or charcoal grill for direct cooking over medium heat. Place bread, cut sides down, on rack; grill, covered, until lightly toasted, 1 to 2 minutes. (Or, you can toast the bread under a broiler.)Advertisement
Rub cut sides of bread with cut side of a garlic clove half, followed by a tomato half. (The toasted surface will act like a grater and capture the pulp and juices of the tomato.) Drizzle bread with olive oil and sprinkle with salt.