Which isn't what they are used for. Its used for convenience, and savoury pies. If you bake a meat pie with fresh vegetables, its more difficult than baking one with frozen vegetables. Something to do with temperatures. And I can promise you that frozen veggies, at least where I'm from? they are way cheaper than fresh. I get a pack of fresh peppers for about 7 bucks CAD. 1 bag of frozen chopped peppers is 10 bucks and there are at least 15-20 peppers in there. Maybe even more.