Place 3½ oz/100 g of steamed apple insert in each of six 5-in/13 cm round silicone flexible molds and level it. Refrigerate until set.
Pour 3½ oz/100 g of the cremeux over the apples in each mold. Place the apple spice cake on the cremeux and press lightly into the cremeux so it comes up the sides of the cake. Wrap tightly in plastic wrap and freeze for 6 hours