Peanut Sprat could eat no carbs, his Bean could eat no meat or vegetables.
My kids have developed a perfect symbiosis. Tonight's dinner was a chicken and assorted vegetable stir-fry with rice. Peanut ate the stir-fry, the Bean ate the rice. We spent a few minutes trying to get them each to have a few bites of what was left, then switched the plates. Between them, we ended up with two clean plates.
Probably not nutritionally sound, but it was awfully cute.