How do I use the cooking boost?

Hey, so when you grill something or fry something to the right of the UI there's a green button that uses cooking boosts or a blue button that will speed it up for free. If it's not working reset the app, make sure you're on the right item, make sure you have enough cooking boosts for the item given (the higher level the item the more time it takes to cook) and if all else fails just wait for the food to be done. Hope this helps! 😃