Bitters of the Month: Cardamom

I've had an eye out for cardamom bitters for a while, ever since my attempt to re-create the Lapis Manhattan.  Recently, my wife spotted this beauty from The Bitter Housewife, based in Portland, Oregon:

On its own (with gin), the bitters is strong, though not as strong as ground cardamom itself so I think there's hope for successful mixing.