Mustard Sauce

By Tessie2



1/2 lb butter or margarine
2-1/2 cups onion
2 cups bell pepper
2 cups celery
Salt and red pepper to taste
3 tbs prepared mustard
1/2 cup lemon juice
1 oz dry white wine
Saute onions, bell peppers, celery in margarine for at least 45 minutes until vegetables are clear. Remove from heat and add all other ingredients. Pour sauce over well seasoned fish and bake in 350F for about 1 hour. Baste two or three times during cooking.