Rinse tilapia and pat with paper towels to dry

Make four squares of tinfoil that are large enough to wrap the tilapia in and place a filet in each tinfoil square

Pour about a tablespoon of olive oil on each filet

Distribute tomatoes, marjoram and garlic (if using) evenly on top of all the filets

Wrap up the filets in tinfoil and place on baking sheet

Bake for about 12-15 minutes, until flesh is flaky (easily flaked with fork) and white