Combine all ingredients except the halibut and mix well. Place halibut steaks in a large resealable bag. Pour marinade mixture over top. Refrigerate for 30 minutes. Preheat grill. Remove steaks from marinade and place on hot grill. Discard marinade. Grill halibut for about 6 minutes per side or until done. Halibut should be flat white color all the way through and flake easily with a fork. Garnish with lemon slices and tarragon sprigs.
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