This slow-cooker Asian tempeh dish is a flavorful and nutritious meal that combines the earthy taste of tempeh with the sweetness of mango and the freshness of spinach. The tempeh is marinated in a tangy Asian sauce and slow-cooked to perfection, resulting in a tender and flavorful protein. The addition of spinach adds a pop of color and nutrients, while the mango adds a touch of sweetness. Serve this dish over rice or noodles for a complete and satisfying meal.