To make balsamic reduction, heat balsamic vinegar in small saucepan over medium low heat until the vinegar has reduced to at least half the original amount. This can take up to 30 minutes. Allow to cool and set aside.
Toast both sides of bread slices in 300 degree F oven. When the bread turns golden brown, remove from oven and cover with minced garlic. Set aside.
Wash and slice the tomatoes. Layer on toasts with basil and mozzarella slices. Drizzle with balsamic reduction and olive oil. Season with salt and pepper, to taste. Serve fresh.