I'm usually impervious to the siren call of Instagram advertisements, but this one couldn't help but get my attention.

From the beautiful Pollen Bakery in Manchester, England was an intriguing looking jar of something called croissant butter — or as they put it, "a crunchy sweet spread made with caramelized croissant crumbs and toasted white chocolate." There isn't a word in that phrase I don't heartily endorse.

The ad promised that the item was "back in stock from Christmas," but it hadn't shown up in my feed until after the holiday. Unfortunately, I can't just drop into an English bakery any old time to pick some up in person, so I was left to figure out how to make croissant butter on my........

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