Step 1

Grate the apple into a large bowl and discard the core.

Step 2

Add the oats, raisins, seeds and cashew milk and mix well. Add the syrup and berries, if using, and mix again.

Step 3

Transfer the mixture to an airtight jar, seal and refrigerate for at least 6 hours, or up to 3 days. This allows the oats to absorb the milk. Return to room temperature before serving.