Chocolate Swiss Roll (巧克力瑞士蛋糕卷)

If you've never made Swiss roll before, or never made one successfully, please don't try my chocolate Swiss roll recipe.

Vanilla Swiss Roll (香草瑞士蛋糕卷)

There're a few common problems with making Swiss rolls: (1) The cake is hard and dry. (2) The crust sticks to the paper the cake is wrapped in. (3) The crust cracks when you roll the cake.