Grilled Cod with White Wine and Lemon Butter Sauce

Seafood always is a big part of our family meals. I try to create different recipes to change the taste of each dish, if I can. Use the same ingredients that I do. Mix and match the ingredients so it doesn't cost much to prepare. With a few ingredients, this wine-lemon butter sauce is one of the must-have recipes.
Ingredients:
Two 6 oz cod fillets
1/8 tsp salt
1/4 tsp paprika
1 /2 tsp old bay seasoning
White wine sauce:
1/2 cup good white wine
1/4 cup fish stock
1 tbs olive oil
2 tbs butter
1 tbs fresh lemon juice
1 clove garlic, minced
1/4 tsp salt                               
1/4 tsp pepper
1/2 cup thinly sliced sweet onions
1 tbs fresh tarragons
1 tbs fresh chopped parsley

Directions:
Sprinkle cod with salt and paprika. Turn the grill on or use the stove top to grill fish inside. Grill fish 3 to 5 minutes on each side and keep warm.

To make sauce:
In a nonstick skillet over medium heat, add oil. Stir in onions, garlic and cook until soft (about 3 minutes). Add white wine, tarragon and simmer. Add fish stock and lemon juice. Cook to reduce sauce. Whisk in butter. Season with salt and pepper. Pour sauce over fish and sprinkle with fresh parsley.