STEP 2/6
Place the cake sheet in a square mousse mold (if not available) and apply the syrup.
Place whipped cream on top.
Also, put syrup on the sheet, apply cream, and put the sheet back on. (Syrup-cream-sheet-sheet-Syrup-cream-sheet)
Leave it in the freezer for about an hour.
(That way, it's easier to cut.)