Global Pantry: Wattleseed
Since none of the spice shops I checked with carried it, I finally ordered some from South's online store. With shipping, this came to $13.21 for 15 grams--about a tablespoon. After reading various recipes online, including an Emeril Lagasse ice cream, I decided that a panna cotta would probably be a good and easy way to maximize the flavor.
Update in response to an email: I copied that photo from South's online store. The "best before" date on the package I bought was 25 Nov 2009.
2 cups cream
1/2 package powdered gelatin (about 1 tsp.)
15 grams wattleseed
2 tbsp. sugar (or more to taste)
pinch of salt
Mix all ingredients and heat gently until mixture begins to steam. Turn off heat, cover, and let sit for 30 minutes. Stir, pour into custard cups, let cool for a few minutes, cover with plastic wrap, and refrigerate for several hours before serving.