This past week marked a special moment in my life. After living with an extra-small oven for years, pushing it hard — using it to test an entire book about casseroles, with pans that barely fit into its little cavity — I'm now the proud owner of a 30-inch double oven. I lucked out and found the exact oven I desired (and couldn't afford at full price) for a fraction of its list price on Craigslist, barely used and with a 3-year warranty remaining. I can hardly wait to fire it up — cakes, ribs, casseroles, oven-cooked beans — this thing will handle them all. I'll tell you one thing I'm not going to be doing with this oven, though, and that's using the self-cleaning cycle. Why?