I find it very difficult understanding exclusive food choices especially more extreme then veganism for instance (since 99.9 % of ALL humans cook from the very discovery of fire in the
prehistory; I don't think there is any tribe left out there that doesn't use fire) I have a feeling you are ready for compromise
though (Cooked potatoes, hot vegetable broth etc.) so that sounds reasonable and good for your child who will not be marginalized and left out of society.