I made my favorite asparagus tonight (I know it's out-of-season, but it was $2 a pound, and I couldn't resist).
Toss asparagus with olive oil and black pepper.
Roast at 400 degrees until it's the texture you like.
Toss with a little bit of butter, and equal amounts of soy sauce and balsamic vinegar.
I was thoroughly enjoying my asparagus, right down to the last bite. Literally. The last piece tasted funny, completely negating my previous enjoyment.