Cream Together Butter And Sugar. Add Eggs And Beat Well. Add Lemon Juice, Mix Well. Add Flour And Baking Powder. Beat To A Smooth Batter. Pour Batter Into A 8 Inch Round Pan. Combine Nuts And Cinnamon And Sprinkle Over The Batter. Bake For 30 Minutes At 350 Degrees. Cool For 10 Minutes And Serve.