He used to have a lot of cooking demo's on his show. I watched him...
...nearly every night in the 80's and early 90's.
Remember the lady with the fire red hair? She was a home cook and he would banter back and forth with her. She was somewhat easily flustered, and Dave took full advantage.
I used to have a cookbook she published that had a bunch of notes about her appearances on Letterman's show. "Bev Tanner" was her name.