Soak planks in cider vinegar (or water or white wine) for at least 2 hours before grilling.
Prepare marinade by combining vegetable oil through garlic in a bowl and let fish marinate for an hour before grilling.
Preheat an outdoor grill to about 350. Put cedar planks on the grates. Lay salmon on top of grates and lower grill lid. After about 15 minutes check fish for doneness by using a fork. You want it to be flaky but not overdone. Remove planks from grill and serve.
Recipe by https://veggingonthemountain.com/ at https://veggingonthemountain.com/2014/08/cedar-plank-salmon/