In a small bowl, combine mango and lemon juice. Line a 6-in. round baking pan with parchment paper; coat with cooking spray. Combine brown sugar and butter; spread evenly into prepared pan. Top with mango mixture; sprinkle with nuts. Set aside.
In a small bowl, cream butter and sugar. Beat in egg. Combine the flour, baking powder, ginger and salt; add to creamed mixture alternately with milk, beating well after each addition. Spoon batter over nuts.
Bake at 350° for 25-30 minutes or until a toothpick inserted near the center comes out clean. Cool for 5 minutes before inverting onto a serving plate; remove parchment paper. Sprinkle with candied ginger if desired. Serve warm. Yield: 4 servings.