High energy foods are important for survival. Here are the figures per 100g portions. Data source: FatSecret.com
Nuts and seeds provide the highest amount of energy by far - because they have high protein, high carb and high fat content - all of which can be converted into energy. 100g provides more than half your daily energy needs. So, it is important to gather and store nuts in winter, and identify sources of seeds. I would highly recommend a 20kg bag of seed for storage - it will last 200 days at 100g per day, and provide for half your energy needs - 20kg seeds
Pine nuts can be harvested during the summer months of July, August and September – by gathering the cones, then drying them out so that they open up. You can create a simple brick kiln to facilitate the drying. Once the cones open, then the pine nuts will fall out. You can leave them shelled, and remove the shells when needed as a source of food. In order to get the pine cones you missed, you can put a tarp under the trees in late summer, and shake the branches hard. This will shake the nuts out of the cones.
All pine trees produce nuts which you can eat. However, some species have much smaller nuts. If you are serious about harvesting your own pine nuts, you should scout out some pine trees in early summer. Pine cones are usually ready for harvesting from July to November, depending on where you live. In Sweden pine cones are available at markets in November.
Drop down on your hands and knees and start crawling over the ground underneath the trees. This gets you close enough so that you can easily spot the nuts that are littering the ground without needing to strain. The nuts you’ll find vary in color from a light brown to a black, with any shade in between possible. Once you find one nut in an area, you'll usually be able to find at least 5 to 20 more nuts in a 2 foot radius easily. The greatest concentration of nuts is usually right around the base of the tree. You can gather a nice 2.5 pounds of nuts in roughly 30 minutes. Not bad at all!
There is an easy alternative method; if it is already late in the season and the pine cones have opened up, then you can use this method for gathering the pine nuts. Put a big tarp under the pine tree. Then shake the branches of the pine tree really hard. This will make the remaining pine nuts (the ones which haven’t been eaten by critters yet) fall out of the cones and land on your tarp.
Carefully twist the closed pine cones until they come off the tree, making sure not to get sticky sap on your hands (it’s worse than super glue!), and put the pine cones all into a bag. Once your bag is full, take the lot home with you.
There are two things that will make a closed pine cone open up: dryness and heat. The easiest way to get the pine nuts out of the cone is simply to lay the pine cones out and let them dry out on their own. It will take a few weeks, but the pine cones will open up. Then you can tap the pine cones and the seeds will fall out. If you don’t feel like waiting 3 weeks for your pine cones to open up, then you can use heat. But if you want them raw, it is best to move to the heater.
Even if you harvest your pine nuts on time, there will some rotten or hollow pine nuts. It is frustrating to shell the nuts only to find out it is rotten or hollow. Here is a simple way to sort out the hollow pine nuts:
Shelling pine nuts is a big hassle and there isn’t a fast way to do it. First you need to leave them to dry for couple of days in a hot climate. You can heat them in the dehydrator at 42 C for 24-32 hours in order to make this process faster. Then you will see little cracked lines. Using the tip of a pointed knife, enter this line and gently separate the nut from the shell. I wouldn’t recommend smashing the pine nut shell because you’ll probably smash the small nut inside too.