Salmon With Creamy Dill Sauce

1 Salmon fillet (about 2 pounds)
1to 1-1/2 tsp. lemon-pepper seasoning
1 tsp. onion salt
1 small onion, sliced and separated into rings
6 lemon slices
1/4 cup butter

Dill Sauce:

1/3 cup sour cream
1/3 cup mayonnaise
1 Tbsp. finely chopped onion
1 tsp. lemon juice
1 tsp. prepared horseradish
3/4 tsp. dill weed
1/4 tsp. garlic salt
pepper to taste

Line a 15-in. x 10-in. x 1-in. baking pan with heavy-duty foil; grease lightly. Please salmon skin side down on foil. Sprinkle with lemon-pepper and onion salt. Top with onion and lemon. Dot with butter. Fold foil around salmon; seal tightly.

Bake at 350degrees for 20 min. Open foil. Broil 4-6 in. from the heat for 8-12 min. or until the fish flakes easily with a fork.

Combine the sauce ingredients until smooth. Serve with salmon.