B.C.
There's plenty he can help you with without cutting anything.
He can stir and mix, spread things like peanut butter, jelly, mayo or cream cheese on bread.
He can toss a salad, use cookie cutters for cookies or biscuits.
Give him some pie dough and have him roll it out.
Or, something the kids were always given to doing the kitchen when my Mom was growing up - make home made noodles - he can cut those with scissors or even a butter knife.
I wouldn't give him really sharp things to cut with until his manual dexterity gets better.
When he's writing well, then he's ready for sharper things to cut with in the kitchen.
http://www.thekidscookmonday.org/kitchen-tasks-for-differ...