How to Make It
Bring 1 1/4 cups water to a boil in a medium saucepan. Stir in 1/8 teaspoon salt, 1/8 teaspoon pepper, and couscous; cover. Remove from heat; let stand 5 minutes. Stir in dill, rind, and juice.
Heat a small saucepan over medium-high heat. Add olive oil and butter; swirl until butter melts. Add shallots; cook 2 minutes, stirring occasionally. Add wine to pan; bring to a boil. Cook 2 minutes; stir in mustard and brown sugar. Remove pan from heat.
Arrange fillets, skin sides down, on a jelly-roll pan lined with foil coated with cooking spray. Sprinkle fillets with remaining 1/4 teaspoon salt and remaining 1/4 teaspoon pepper. Spread half of mustard mixture evenly over fillets. Broil 6 minutes or until desired degree of doneness. Spread remaining half of mustard mixture over fillets. Serve fish with couscous.
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