There are lots of ways to eat a pine tree.
Entrance Level: pine needles! If you’re weeksauce, you can take a handful of young needles, crush them up, and put them in boiling water to make a tea (a tisane, if you’re an asshole). The flavor is fresh and green and tastes pleasant when sweetened. If you’re hardcore and just want to eat a tree for the hell of it, you can just strip off some needles with your teeth and chew on them while maintaining eye contact with your foe. Good source of vitamin C, so be sure to bring a glade of pine trees with you on sea voyages to prevent scurvy.
Beginner Level: pine nuts! They’re technically seeds, not nuts, so few people are allergic to them. Most pines produce stupid, tiny seeds that aren’t worth the trouble, but if you find species with larger seeds, fucking go to town. They’re amazing. Eat them raw or roast them and put them in everything.
Intermediate level: pine pollen cones! In spring and early summer, male trees produce pollen cones. I guess you can use the pollen as a cooling ingredient, but you can also just bite them off the tree raw. It’s not great, but it’s not terrible. It’s also roughly equivalent to eating a tree’s…. male reproductive material.
Hardcore level: pine bark! If you strip bark from a tree, you’ve sentenced it to death, so don’t do it unless the tree is going to be killed anyway. Don’t murder a tree just to eat its skin… that’s weird. But, if a pine tree has been cut down, you can strip off the bark and eat the inner layer. If it’s hard and brown and crusty, don’t fucking eat that. The inner layer closest to the wood of the tree is softer and pale and moist. If you separate that from the outer bark, you can fry it up and eat it like a potato chip.
Inhuman level: pine wood. Humans can’t actually eat pine wood. You could be the first… I guess…. I won’t stop you from trying.