It's a product called Flavacol. In basic terms, Flavacol is a butter-flavored salt. It's very fine in size, artificially colored, and gets its taste from artificial butter flavor. It's not exactly ...

To make great popcorn, use butter-flavored coconut oil for popcorn and Flavacol. Flavacol is finely ground salt and diacetyl, the magic butter flavor our scientist goes to great lengths to recreate.