* Lightly toast 12 sourdough bread slices. Rub the cut side of a halved garlic clove over one side of each of 6 bread slices. Spread 1 tablespoon soft goat cheese over each of remaining 6 bread slices. Combine 1 tablespoon balsamic vinegar, 2 teaspoons extravirgin olive oil, 1/4 teaspoon kosher salt, and 1/4 teaspoon freshly ground black pepper; drizzle evenly over 6 (1/2-inch) beefsteak tomato slices. Layer 1 bread slice, garlic side up; 1 beefsteak tomato slice; 4 basil leaves; and 1 bread slice, goat cheese side down; repeat procedure with remaining ingredients.