The first thing I thought of when I saw this topic was the Northern Exposure episode where "Adam" made demi-glace. Many (most) NE episodes included food, but that was my favorite.
I thought someone else had already mentioned that, though, so I found this post by cindyloo:
"Not a movie but a TV show -- the episode of Northern Exposure when Maurice throws a huge feast for some reason -- Adam the crazy barefoot chef comes back and makes this amazing, huge meal for everyone in town, ranting and raving about his Sabatiers and his veal demi-glace."
Also, I agree with EdSails that MASH had some tremendous food shows. The "Adam's Rib" episode where they had the ribs shipped from Chicago (but forgot the cole slaw) was probably the best.
"Dallas" had some great BBQ shows, and many shows featured family meals. (Incidentally, Dallas was my favorite series EVER. Next was MASH.)
"Waltons" always had good food. Corny, yes, but that show was much better than 99% of the trash that's on network TV today.
I'm sure I'll think of others...