Heat a chargrill pan over medium-high heat. Brush both sides of bread slices with 2 tablespoons oil. Cook for 1 to 2 minutes each side or until golden and charred. Rub cut side of garlic over 1 side of each bread slice.
Combine tomato, basil, vinegar, sugar and remaining oil in a bowl. Season with salt and pepper. Spoon tomato mixture onto chargrilled bread. Serve.