I make mine from scratch , when my tomatoes are in. I scald and skin the tomatoes.
Then put them in the processor with bell peppers, and onions. Stew them up for several minutes, then add yellow squash and zucchini if I have them, for a few minutes. I add tomato pastes and Italian seasons at the end. I make and freeze about five quarts each spring.
You can do the same thing with store bought. Just add squash for about 15 minutes. You can't want to over cook your squash.
Quail hunting is like walking into, and out of a beautiful painting all day long. Gene Hill