I did a spin-off of the Chefstep's Carrot and Perfect Yolk. Used almond instead of the hazelnuts and having never heard of Nasturtium, I used some fresh sage from my garden. The crumble recipe by the way is very good and I recommend trying it out,
http://www.chefsteps.com/activities/hazelnut-nasturtium-crumble even if you don't have Nasturtium or Hazelnuts or Hazelnut Oil (use olive oil)......