Place cheese, basil, and lemon zest in a food processor and process until smooth. Add 1 teaspoon salt and 1/2 teaspoon pepper and pulse 2 times to incorporate.
Heat grill to high. Brush bread with olive oil, season with salt and pepper, and rub with garlic cloves. Grill bread on each side for 1 minute or until slightly charred. Spread each slice with some of the farmer's cheese mixture and top with tomato and more cracked black pepper.