Pine kernels are a fun size in more than one sense. In fact, pine kernels are really a seed. The seed sits in the pine cone, which grows on the pine tree - a coniferous tree, which is grown mainly in the Middle East, the USA and China. As a raw material, pine kernels are quite expensive, but there is a natural reason. The cones takes 3 years to mature, and then they must be heated to release the seeds. Each pine loin gives approx. 40-50 pine kernels, all of which are surrounded by a chestnut-brown skin that is hard to remove.
In November and December you can buy whole pine cones in selected supermarkets and let them stand in a warm place until the seeds slowly fall off the cone. Then release the individual pine nuts by removing the hard shell. It's a huge job, but it's worth the effort to get rid of the little delicate grains from the pine cone.