1 stick butter, melted
Juice of 1 lemon
1/4 tsp. paprika
1/2 tsp. onion salt
1/2 tsp. garlic salt
2 tbsp. oil
1/2 tsp. salt
1 tsp. vinegar
1/2 tsp. dill weed
1 tsp. vermouth

Mix all ingredients and marinate fish fillets for at least 30 minutes. Two hours is better and then grill as usual, basting with marinade.