Put the flour, eggs, baking powder, vanilla essence and the milk in a blender. Pulse for a few seconds, then add the oil and lemon juice.
Pulse again. Add more milk, if needed, to have a thick, but pourable batter. Fold in the poppy seeds and lemon zest.
Heat the waffle maker. Once it’s hot, spoon in the batter and seal. Following the machine instructions, cook the waffles for about 3-5 minutes - they should be golden brown and crispy on the outside, soft inside.
You should be able to get 3 or 4 waffles from the mixture (depending on the size of your machine).
Serve with lemon juice and honey or maple syrup.