Xander is on a peanut butter and jelly sandwich kick. All PB&J all the time. He'll happily--and insistently--eat it for 2 meals a day. The way he asks for it, since he can't say "peanut butter and jelly," is to walk over to the refrigerator, whine until I open the door, then point to the jars of peanut butter and jelly in the door. Lately, he's taken to pointing to Hari's jam, which is this expensive Trappist Monk manufactured blueberry jam. If I take out just the standard Welch's grape jelly, he'll grunt and continue to point at the Trappist jam.
At first I made him sandwiches with the Trappist jam. Then I remembered how easy it is to fool small children. Now, I take out both jars, the jam and the grape jelly, to placate him. Then, when he's not paying attention, I just make the sandwich with the easier-to-use (squeezable) and less expensive grape jelly. Everyone's happy that way!