Place the petite medley tomatoes into a large clean jar or container, add in garlic salt, peppercorns, and smashed garlic.
In a saucepan, combine the water, white vinegar, and sugar.
Heat until dissolved, and pour the warm vinegar mixture over the tomatoes.
Add fresh basil if using.
Cover and refrigerate overnight.
Enjoy the next day cold, tangy, garlicky, and packed with flavor.
