Fill a large saucepan or wok with 2 cups water. Add lemongrass, sake, ginger, star anise, and orange peel. Bring to a boil. Spray the bottom interior of a bamboo steamer with cooking spray and set over saucepan; add salmon fillets. Cover and steam until salmon is just cooked through, 4 to 5 minutes. Serve over white rice with sake butter and lime wedges.
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