Mix the chopped grape tomatoes, diced garlic and red onion in a bowl. Add the basil that you've chopped extremely finely or blended in a food processor. Add the vinegar, olive oil, salt, pepper to taste and mix well.
Cut the bread into slices with a thickness of at least 3/4″ (2 cm). Put them to get toasted on one side in a greased with butter tray - the bread needs to be lightly toasted on top, while their inside must remain soft.
Put some of the tomato mixture on each slice and serve the Italian bruschetta.