Just to add to the above, the reason I mentioned it is because if you are struggling to find meat then cooking whatever greens you forage in beech oil will be a way of adding fat etc to the greens. You use the oil like you would Olive Oil.
This link here takes you to a page explaining uses for various nuts.
http://www.fao.org/docrep/005/Y4351E/y4351e0c.htm
They are handy to know about because as was mentioned earlier in the thread, a lot of the wild veg you find is used more as a supplement to the main portion of food like rabbit or pigeon and would be hard to live off on their own. Nuts can add fats/protein/carbohydrates to the greens. I'm not sure how long the nuts themselves can be stored and still maintain their nutrients but once made into an oil and stored correctly it can last 5 - 10 years
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