MIX juice, 2 tablespoons oil and 1 teaspoon of the thyme in a glass dish. Add salmon; turn to coat. Cover. Refrigerate 30 minutes.
MIX sugar, remaining spices and orange peel. Remove salmon from marinade. Place in foil-lined baking pan. Discard any remaining marinade. Rub top of salmon evenly with spice mixture.
ROAST in preheated 400°F oven 10 minutes or until fish flakes easily with a fork. Heat remaining 1 teaspoon oil in a large nonstick skillet on medium heat. Add spinach, cook 2 minutes or until wilted. Serve with salmon.
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