During the summer when peppers are on sale and there are endless quantities, pick up a large number of them at your local produce store. Dice them up to your desired size and lay them in a single layer on a cookie sheet in the freezer. This is what you call flash freezing. Once they are frozen, only a few hours, transfer into a large freezer bag or container and keep in freezer for handy access all winter long. They won’t stick together and they are ready to add to stir-fry or any other recipe any time you wish.