1. Preheat oven to 400 degrees.
2. Melt butter in a small skillet over medium heat, add garlic, and saute 1 minute. Add breadcrumbs, tarragon, lemon rind, salt and pepper. Stir well.
3. Place halibut on a parchment lined baking sheet. Combine mayonnaise and horseradish; spread over each fillet. Top with crumbs, patting lightly to help them adhere. Bake 10-12 minutes, or unitl fish is tender and crumbs are golden.
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