Thanks for the idea, St.  Bought some and nosed around the web for some recipes.  Found several suggestions to combine achiote with ground coriander seeds in about equal quantities.  I like it a lot.

I made a rub for a pork tenderloin with pretty much equal parts of achiote, allspice, coriander, fennel seed and black pepper.  Rubbed, let it sit for a few hours, and broiled it 10 minutes a side.  It was a big hit.