My wife used to make Chili Sauce which required long cooking to thicken. She would cook it down in our electric oven/turkey roaster which she would put out on the patio...wouldn't heat the house. It only had to be stirred a few times before it was ready. Years ago when I was a boy there was a cannery here and they would make chili sauce in the fall...the kind in the little round bottles. The whole town smelled liked chili sauce and it was wonderful.