Put half of the peas aside.
Chop the leek/spring onions and the garlic, if used. Put these in a liquidiser and add all the other ingredients (except the peas you put aside). Blitz until you get a thick batter. Add some oil and blitz again.
Rest the batter, if you've time for 15 minutes, then fold in the peas.
Grease a pancakes pan and spoon 3 or 4 dollops of the batter separately in there and let them spread out a bit to form disk shapes. When the surface is no longer runny turn them over and cook for about 30 seconds, then transfer them to a plate. Repeat until you have used up all the batter.
Serve warm or at room temperature.