Preheat grill to medium-low.
Bring 2 cups (480ml) of water to a boil and stir in salt, sugar and crystallized ginger until dissolved. Add juniper berries and stir.
Pour the hot mixture into a large container followed by the remaining water, heavily iced. Stir.
Gently submerge drumsticks into the liquid and brine for 3 to 4 hours.
While the turkey brines, combine the butter, thyme and lemon zest in a small bowl and stir together. Set aside.
Remove drumsticks from brine and pat dry. Season with salt and pepper. Place onto grill and close lid. Grill for 45 to 1 hour, basting with the butter mixture every 10 minutes and turning occasionally.
In the last 20 minutes begin basting drumsticks with sweet and tangy barbecue sauce, basting every 10 minutes.
Once fully cooked, brush drumsticks with more sauce. Serve.