answer:Celery, whether chopped or whole will turn to mush due to high water content if frozen. “The capsicum I usually just chop and freeze. I freeze it first on baking paper in a single layer on a tray and when frozen I put it in bags. This makes it easy to just grab a handful when required, as they don’t form one solid lump. Frozen capsicum can be used in stews, soups and on pizzas.” Source You can make any kind of soup by starting with chopped onions, celery (garlic) sautéed in a little olive oil. Peppers, chopped and sauteed, can be added to soups, stews, chili, spaghetti sauce and other simmer-on-the-stovetop dishes.