Preheat the oven to 350F (180C). Butter a 10X15 inch baking tray and line it with parchment paper.
In a large bowl add eggs ,sugar and vanilla extract.
Beat with an electric mixer until lemon yellow and foamy.
Add pumpkin and lemon juice and orange zest if desired. Fold until well combined.
Sift the flour, baking powder, baking soda, cinnamon, ginger, nutmeg, and salt over the bowl. Gently fold the flour in.
Pour the batter into the pan and spread evenly into the corners.
Bake for 15 minutes and cool for 10 minutes in the pan. Take a kitchen towel and generously sprinkle with powdered sugar. This helps the cake not stick to the towel.
Sprinkle the top of the cake with powdered sugar.
Roll the cake up in the towel. Let cool completely.
Whip the cream with an electric mixer until it forms stiff peaks. In another bowl, beat Mascarpone with powdered sugar, cinnamon, and vanilla. Fold together.
Unroll the cake and spread the filling evenly over the cake.
Roll the cake back up. Sprinkle with more powdered sugar.