This one has been a long time coming, something you could have guessed based on what’s been revealed so far. I’ll let the video do the talking.
1. Grow crops on the farm for ingredients or buy them from the general store.
2. Buy food so Rosy can learn new recipes
3. Cook food at the campfire using the recipes and ingredients you’ve gathered.
4. Gain Chef Ranks so your food turns out better and its effects last longer
5. Give your party battle perks or sell the food back to a store for a profit.