It's slightly labor-intensive, but well worth it.
Start off by canning a few sweet banana peppers, per this recipe (except substitute apple cider vinegar for half of the white vinegar). Your family will complain bitterly about the smell while the brine is cooking on the stovetop. Ignore them. (Also ignore the recipe's directive to wait two weeks for the peppers to finish. Who can wait two whole weeks?)
Pick a nice, sweet, juicy Jersey tomato. Out of your garden is nice, but there are plenty of farmstands with tomatoes around these days.
Slice a bun in half. Sprinkle one half with a little shredded mozzarella or cheddar cheese, and heat slightly in the microwave or toaster oven until the cheese just melts.
Layer one slice of tomato, a couple spoonfuls of pickled peppers, and then another slice of tomato on the bun.*
Sit quietly and savor the goodness. Subway, eat your heart out.
*Terzo's question while I was taking this picture: "MOMMY. Why are you taking a picture of your SANDWICH?"