Line the bottom of an 8-in/20-cm paisley mold (or an 8-in/20-cm ring mold) with a cardboard cake round, cutting it to fit. Line the sides of the paisley mold with a strip of acetate or plastic wrap, cutting it to fit.
Cut the cake into a paisley shape that just fits inside the mold. Slice three even layers from the chiffon sponge, between ¼ and ½ in/0.6 cm and