Mix the olive oil and the balsamic vinegar in a bowl.
Grate the parmesan cheese, and add it in the liquid.
Cut the tomatoes and the basil in small pieces, and mix it in the liquid.
Press the garlic clove and pour it in the mixture together with the salt, and mix it all well.
Toast the bread slices and let them cool down.
Cut the mozzarella cheese in slices.
Place the prosciutto ham and the mozzarella on the bread, add tomato mixture on top and the bruschetta is ready to be served.