Make old-fashioned piccalilli relish with green tomatoes, onions, peppers, vinegar, and pickling spices—a tangy topping for burgers, sausages, and meats.
Slice all vegetables into 1/4-inch thin slices and place in cheesecloth.
Alternate tomatoes, onions and peppers, sprinkle salt between each layer and let stand overnight.
NOTE: do not let vegetables come in contact with juice, you must support it and let juices drain from vegetables. The next day place all vegetables into a large pot with enough apple cider vinegar to cover and place the 1/2 cup of spices tied in cheesecloth into the pot.
Cook slowly for 2 hours or until onions are tender. Seal in clean jars using the hotpack method.