Preheat oven to 450 degrees F. Spray a 13x9 baking dish with cooking spray. In a large bowl, add couscous, onions, coriander, paprika, pepper sauce, almonds, currants and chicken broth; mix thoroughly. Place couscous mixture in baking dish.
Rinse any ice glaze from frozen Alaska Sole fillets under cold water; pat dry with paper towel. Place fillets in a single layer on top of couscous. Brush each fillet with butter and top with lemon slices.
Cover pan and place in heated oven; roast 30 to 35 minutes for frozen fillets or 20 to 25 minutes for fresh/thawed fish. Cook just until fish is opaque throughout. Sprinkle with parsley before serving.