Toast the bread. Cut white bread into slices. Spread each slice with olive oil and fry in a hot dry frying pan until crispy. Cut a clove of garlic and grate it on each crouton. Finely chop the remaining garlic.
Prepare the vegetables for the filling. Cut the tomatoes into quarters. Cut the avocado and cucumber into small cubes. Cut the basil into thin strips.
Make bruschetta. In a deep bowl, mix balsamic vinegar with olive oil. Add chopped garlic, tomato pieces, avocado, basil and cucumber. Salt. Mix. Spread each piece of bread with the resulting mixture.