For the falafel: heat the oven to 200°C (180° fan) 400°F gas 6. Line a baking tray with non-stick baking paper.
Put all the ingredients for the falafel into a food processor or blender and blend to a paste.
Scoop small balls of the mixture onto the baking tray. Bake for 20-25 minutes until the outside is crisp.
Carefully split open the pitta breads to make a pocket. Add the lettuce and cucumber and a little coriander to each one. Put the falafel into the pitta breads and garnish with lemon wedges.