In a pan add oil, finely chopped garlic, finely chopped ginger, finely chopped onion, finely chopped green chilli, finely chopped celery, salt, finely chopped carrots and finely chopped french beans and sauté.
For the filling; in a bowl add the sautéed vegetables, boiled and grated potato, boiled mixed lentils, breadcrumbs and chopped coriander and mix.
To make the pancake batter; in a bowl add refined flour, gram flour, turmeric powder, crushed black pepper, salt, milk and baking soda and whisk.
In a hot pan add oil. Make a patty of the filling and pan sear it from both sides.
In another pan add the batter and make a pancake. Once cooked, remove and cut with a ring mould. Make one more.
Place one pancake on a plate. Add sliced onion, prepared patty, sliced tomato, sliced cucumber and gherkins and cover with the other pancake to make a burger.
Serve the lentil pancake burger with tomato ketchup.