Grilling salmon on your George Foreman Grill is very easy and can be done with a minimum of ingredients. A basic salmon filet should be approximately 4 oz and 3/4″ thick.f you don’t have cooking spray, a light brushing of olive oil will do. Though the Foreman Grill is non-stick, fish can become very sticky so the spray or oil will make cooking and cleanup much easier. Brush both sides of salmon filets with olive oil and squeeze some fresh lemon on just before cooking.