How to Make It
Preheat oven to 325°F. Place shallot, peppercorns, garlic, ginger, turmeric, lemongrass, lime leaves, salt, and sugar in a food processor, and pulse until finely minced, about 10 times. Heat 3 tablespoons coconut oil in a large skillet over medium-high. Add shallot mixture, and cook, stirring constantly, until fragrant, about 1 minute. Transfer to a small bowl; stir in orange juice. Set aside.
Heat remaining 1 teaspoon coconut oil in skillet over medium-high. Add spinach, and cook, stirring often, until just wilted, about 1 minute.
Place half of wilted spinach in a 13- x 9-inch glass baking dish. Place fish on top of spinach. Tuck remaining wilted spinach around fish. Spread orange juice mixture evenly over fish and into fish cavities. Cover dish with parchment paper and aluminum foil.
Bake in preheated oven until fish is just cooked through, 40 to 50 minutes. Serve with jasmine rice.
Substitute 6 tablespoons fresh orange juice and 2 tablespoons fresh lime juice if sour oranges are not available.