Put heavy whipping cream into a very clean, cold glass medium mixing bowl. Mix until the cream forms a stiff peak. Mix in approximately confectioners sugar, until blended all the way in. (add more if you prefer it sweeter) Mix in 1 tsp of the orange flavoring and the orange zest. After the cake has cooled completely, plate the bottom layer, then put the whipped cream mixture on the bottom layer only. Layer several sections of the mandarin oranges on top of the whipped cream. Add the top layer, and frost the rest of the cake with the whipped cream. Add more of the mandarin oranges on the top. This cake is best if it is made a day in advance, keep refrigerated. If you have leftover batter, make some orange blossom cupcakes!