Make the batter: Add all ingredients to a blender and blend until smooth.
Cook the crepes: Heat a non-stick frying pan over medium heat and lightly oil if needed. Pour in enough batter to thinly coat the base of the pan. Cook for 2–3 minutes until set, then flip and cook for another 1–2 minutes.Repeat with the remaining batter.
Make the Cashew Cream: Blend all ingredients until completely smooth and creamy. Add a splash more water if needed to loosen.
Serve: Spread the cashew cream over each crêpe, add spinach and pickled red onions, then roll and serve.