1. Boil the French beans, carrots, green peas and the potatoes in sufficient water in a heavy bottomed vessel till done.
2. Drain out the excess water from the vegetables.
3. Cool completely. Dry grind the bread slices.
4. In a bowl mix together the boiled vegetables, ground bread, corn flour, ginger-garlic paste, powdered masalas, coriander leaves and salt. Mix well.
5. Make round medium sized patties.
6. Shallow fry the patties on a medium flame till golden on both sides.

To Serve:

1. Cut the bun into 2 halves.
2. Apply butter on the inner sides of each bun.
3. Place an onion ring on one half.
4. Place a vegetable pattie on it.
5. Top it with a tomato slice and some grated cheese.
6. Place the other half of the bun on it and brush it with a little butter.
7. Place the bun in a pre-heated oven at 140 degree C for 4 to 5 minutes.
8. Repeat with remaining buns.
9. Serve hot with potato chips and tomato ketchup.