Halibut Olympia

Ingredients

• 3 tablespoons olive oil
• 3 tablespoons dry mustard
• 1 tablespoon melted butter
• 1 tablespoon lemon juice
• 1 tablespoon kosher salt
• 2 teaspoons garlic powder
• 1 teaspoon crushed red pepper flakes
• 1 teaspoon freshly cracked black pepper
• 1 teaspoon dried dill weed
• 1 1/2 pounds halibut fillet
• 1 1/2 cups sour cream
• 1 red onion, chopped
• 3 tablespoons lemon juice
• 2 tablespoons chopped fresh parsley
• 2 cloves garlic, minced
• 1 tablespoon kosher salt
• 1 teaspoon freshly cracked black pepper
• 1 teaspoon dried dill weed
• 1 1/2 cups shredded Cheddar cheese
• 1 cup canned Cheddar-flavored French-fried onions