kentish cobnuts

i got some kentish cobnuts in my vegetable box this week - any ideas how i can use them?

the kilo of nuts has, over an hour of hard labour later, resulted in 300g of shelled nuts. i want to use some in a plum cake but am unsure whether to toast them before grinding and adding to the mix in place of ground almonds. that leaves me with c100g left though - any ideas?