The best way to keep sponge cake moist is to prevent it from being exposed to air. Here's a breakdown of effective methods:
1. Airtight Storage:
- The ideal solution is an airtight container. This prevents moisture from escaping and keeps the cake fresh for longer. Make sure the container is large enough to hold the cake without squashing it.
2. Plastic Wrap (Cling Film):
- If you don't have an airtight container, tightly wrap the sponge cake in cling film (plastic wrap). Ensure there are no gaps or exposed areas where air can reach the cake. For extra protection, wrap it in multiple layers.
3. Inverted Bowl Method (For Iced Cakes):
- If your sponge cake is iced, you can't directly wrap it in plastic. Instead, place a large, inverted bowl over the cake to create a protective barrier and trap moisture. This creates a mini-environment that slows down drying.
4. Additional Tips for Maintaining Moisture:
- Don't refrigerate (unless it contains perishable fillings/frostings): Refrigeration can actually dry out sponge cake. Store it at room temperature unless it has a filling that requires refrigeration (e.g., cream cheese frosting, custard).
- Cut Side Protection: If you've already cut into the cake, focus on protecting the cut edges. Press a piece of cling film directly onto the cut surface before wrapping the rest of the cake.
- Freezing: For longer-term storage, you can freeze sponge cake. Wrap it tightly in several layers of cling film, then place it in a freezer bag. Thaw completely at room temperature before serving. Freezing properly prevents freezer burn and keeps the cake surprisingly moist.
- Moistening Agents (If Necessary): If your cake is already slightly dry, you can brush it with a simple syrup or a bit of milk before wrapping to add moisture back in.
By using one or a combination of these methods, you can keep your sponge cake moist and delicious for days.
