I think you've answered your own question, hun.

I gave DD her dinner/lunch/breakfast in one bowl and let her eat what she felt like. If it got chucked, she obviously didn't feel like eating it, so meal time was over! Although in our house, if it got chucked, we had two very convenient floor cleaners sitting right by the high chair, in the shape of small white dogs. DD was probably more concerned with not losing her food to them than playing with it!