Is it normal kids hates indian food chinese food and blue apron plated

we are trying to get our 4 and almost 7 year old to like gourmet food. We buy from plated and blue apron and end up eating it ourselves because the kids hate the artisan ingrediants.we also put a lot of sriracha and kale and buy a lot of indian and chinese takeout and taco bell which which my son really doesn't like. He says it makes him sick. He will eat veggies and a lot of food but he doesn't want spicy sauce all over it. He wants plain food which is so boring he even tries to cook himself and his sister grilled cheese and microwavable pancakes and hot dogs. We tried the you will eat nothing if you don't eat what we eat thing and he will wait until we go to bed and eat 20 peanut butter and jelly sandwiches or eat a friends house.we don't want to cater to their needs but we don't want them to be malnourished.