This is one of the steps in July's goal set, more details can be found here:
https://forums.storm8.com/showthread....-and-fireworks!!
But for a quick answer, silk pie is found in banner oven, and if you don't want to cook it, there's only 2ways to have the goal disappear. Wait it out, or use the gem skip button. But if you do the latter, you're just going to get the next goal in the set. So unless you're willing to spend a lot of gems to unlock the final prize, you're just going to have to ignore the goal for the next 11 days.