Meet tonka, “Bake Off’s” secret spice

Week two of “The Great British Bake Off” put the focus on biscuits as the bakers whipped up a dozen Hobnobs and showstopping memento time capsules. Of course, bakers also had to get creative with their flavors. One, in particular, incorporated a rather unique ingredient — tonka, which has been referred to as vanilla’s “cousin.”

In the signature challenge, Aaron Mountford-Myles, a London-based baker, made slice-and-bake cookies inspired by his best friend’s daughter, Winnie. The aptly named “Mini Winnies,” which look endearingly cartoonish, featured a tonka and malted milk biscuit dipped in milk chocolate. They later received compliments from Prue Leith, who praised the intricate “layers of flavor.” Paul Hollywood also agreed that they were “delicious.”

There’s not much explanation — or d