Fresh Plum Cake

[frangipani]

I needed to use up about a dozen fresh plums in a jiffy, so I googled around for a few recipes and tweaked what looked to be the most promising. I didn't quite manage to squeeze in all the plums into this recipe, but it is delicious nevertheless. ;)

Fresh Plum Cake (recipe plus a picture)

This recipe uses nuts, but I would love to know a good substitute for the ground almonds.

(Cross-posted to omnomnom)