Preheat the oven to 220'C.
Whisk together the milk, water, eggs and flour. Season and leave to rest in the fridge for at least half an hour.
Place the moulds in the oven with a drizzle of oil in each one and heat in the oven for 10 minutes. Pour the mixture into each mould and bake for around 10 minutes, until risen and golden brown.
«Add some chopped fresh herbs or grated horseradish to the batter to change the flavour of the puddings.»