Poaching fish in soy sauce is a simple and healthy cooking method that results in a tender and flavorful dish. To make soy sauce poached fish, simply bring a mixture of soy sauce, water, ginger, garlic, and green onions to a simmer in a large pot. Add the fish fillets and cook them gently until they are cooked through and flaky. Serve the poached fish with steamed rice and vegetables for a complete meal.