Use this recipe to make Pickled Green Tomatoes and Shrimp Toast.
Combine vinegar, 3/4 cup water, sugar, spices, and 2 tablespoons salt in a saucepan. Bring to a boil, stirring until sugar is dissolved. Fill clean containers tightly with tomatoes and onion. Add boiling brine to cover completely. Let cool completely. Cover, label, and refrigerate at least 1 week before serving, or up to 3 months.