Preparing pine and fir needles collected in the wild

I live near a small patch of forest that features various pines and firs. I have been thinking to use their needles for home-made gravlax.
What would be the safest way to prepare them in a way that would retain their qualities?
Best Answer
Picture open source from Steven Stolper. Nature Outside.
So as you see above. The spring time is the best time collect Douglas Fir needles. The light green new ones make the best forage food. Can be boiled in a tea or added as any spice atop fish, foul or steak.
There are other varieties of needles to seek out. It really depends on your area and the season. Get a good field guide, pick what your can, boil for taste in a tea. If it’s to your liking, use fresh, cleaned and cooked at 225 F or better.
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Wild Food Foraging- Pine / Spruce / Cedar / Fir- Evergreen Teas
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Images: Rachel Claire, Maria Orlova, Rachel Claire, Marta Wave