Sabotage the child, not the food.
When my daughter was about 2, she liked to help with the cooking by sitting on the worktop and passing things. This stopped when she squeezed half a tube of garlic purée into her mouth, and swallowed it with every sign of enjoyment. Six hours later, the garlic began to emerge through her pores. It kept on emerging for six days, by which time her playgroup had shampooed their carpet, our neighbours had washed their dog twice and my MIL had made innumerable remarks about Pakis, the racist old trout.
(all my scars face forward possesses 2.5% of a hyperalloy combat chassis, Tue 23 Sep 2008, 22:40, Reply)