Wash fish and pat dry with paper towels and place into a deep baking dish. Combine mustard, honey, oil, garlic, thyme, lemon juice, salt, and white pepper. Using a spoon, coat fillets with mixture. Cover dish with plastic wrap and place into refrigerator for 30 minutes.
Preheat grill for medium-high heat. Place fish onto grill, skin side down, and cook for 5 minutes. Carefully, turn fish and cook for an additional 3-5 minutes. When the flesh of the fish no longer appears shiny and flakes easily, remove from grill and serve.
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