Source: https://www.sccs.swarthmore.edu/users/03/easter/recipes.htm (available on the Internet Archive)

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- 1 loaf of garlic bread, made in the fashion you prefer, but with the bread toasted
- 1 Roma tomato, chopped
- 3 cloves garlic
- 1/2 cup Parmesan cheese
- a handful of parsley, chiffonaded
- salt
- pepper
- balsamic vinegar

Slice the garlic bread, and broil it lightly so that the cut edges are crispy and a little bit browned.
Next, treat it with more garlic, if you wish - rub the clove onto the edges of the bread, or mince the garlic and add it to the tomato. 
Put the tomato (and garlic, if you want) into a bowl, with the parsley and about 1/4 cup of balsamic vinegar. 
Add salt and pepper to taste, and let the mixture sit for a moment. If it seems too dry, add more vinegar.
Turn on your broiler, and spoon the tomato mixture onto the slices of garlic bread, which you've placed on a broiling tray. 
Grate some Parmesan cheese onto the top of these, then broil them until it browns and melts a bit. Serve.