A few tips, I ahve been experimenting with pine needle tea, and found out how to get a lovely, strong cup.
use the new shoots that grow in spring ideally, although the dark green older stuff works aswell, but you'll need more and need to extend the cooking time.
take a big handful, and chop up really fine, or even better, add them to a bit of cold water and blend for a minute, to make some 'mulch'.
put that in a pan and add some water, bring up to just below the boil (I heard boiling can destroy some vitamin c content), then put on simmer for about 10 minutes, or until it 'looks' ready. by that I mean it should have turned a cloudy green colour.
Then either pour into a mug, using some more pine needles to filter out the bits, or if you are at home, put it in a caffetiere and plunge.
you should now have a quite strong smelling and tasting pine needle tea. add a bit of honey to taste. (or birch sap or whatever...)