Sweet peppers are the name of the game here, but tossing a few hot ones into the mix would be nice as well. This recipe was developed to preserve the summer bounty from your garden or farmers' market; it freezes well for up to 3 months. Try this mélange of peppers, tomatoes and onions with a plate of cheese and crackers; toss it with pasta and chopped herbs; or pile it on grilled chicken and melt some fontina on top.