Ответ:

you fry potatoes in a frying pan or boil in a saucepan or bake in roasting dish

you cook spaghetti in a saucepan

you cook rice in a saucepan

You grill chicken on the barbecue, or frying pan, or boil it in a sauce pan, or bake in roasting dish

You fry onions in a frying pan

You boil carrots it in a saucepan