Ice Box Cake

The custard filling can be made up to 1 day ahead and refrigerated in an airtight container; re-whip briefly before using if it has separated. The assembled cake actually improves after 4-8 hours of refrigeration as the layers meld together and the cake absorbs moisture from the filling, making it ideal to assemble the morning of serving for an evening dessert.

Store the assembled cake covered in the refrigerator for up to 3 days. The cake will continue to soften and absorb moisture from the filling, becoming more pudding-like over time. Do not freeze, as the gelatin-based custard will weep and separate upon thawing. For best texture, consume within 24-48 hours of assembly.