Prepare the Balsamic Glaze: Pour the balsamic vinegar into a small saucepan over medium heat. Bring to a gentle simmer and reduce the heat to low. Let it cook, stirring occasionally, for about 8-10 minutes, or until the vinegar has thickened enough to coat the back of a spoon. Remove from heat and set aside to cool (it will thicken further as it cools).

Prepare the Topping: In a medium bowl, gently combine the diced tomatoes, minced garlic, chiffonade basil, 2 tablespoons of olive oil, red wine vinegar, salt, and pepper. Stir lightly to coat and let the mixture sit at room temperature for at least 15 minutes to allow the flavors to meld.

Toast the Bread: Preheat your oven broiler to high or heat a large skillet over medium heat. Arrange the baguette slices on a baking sheet. Brush both sides lightly with 2 tablespoons of olive oil.

Broil or pan-fry the bread until golden brown and crisp, about 1-2 minutes per side under the broiler, or 2-3 minutes per side in a skillet. Watch carefully to prevent burning.

Rub the Toast: Once the bread is warm and toasted, immediately rub the surface of each slice with the cut side of the reserved whole garlic clove for a subtle garlic flavor.

Assemble and Serve: Spoon a generous amount of the tomato mixture onto each prepared slice of toast. Just before serving, drizzle the thickened balsamic glaze over the top of the bruschetta.