First, head on over to the Barnyard BBQ venue and choose the episode you want to play:



Next, tap on one of your available Prep Recipe Stock Slots [in this screenshot, Barb (Braised Carrots) is the active Prep Recipe] to bring up a list of available Prep Recipes for this episode:



Scroll to the very top of the Prep Recipe list and you will see Peanuts available for x2 gold. Tap on the it to add it to your Stock Slot for your episode:



Now that the peanuts are in the Stock Slot, pay the two gold to activate it then start the episode: