Step 1

Process the lentils, breadcrumbs, yoghurt, curry paste, shallot, coriander and egg in a food processor until well combined. Transfer to a bowl. Season with salt and pepper. Stir in the flour.

Step 2

Divide the mixture into 4 equal portions. Use floured hands to shape each portion into a 2cm-thick patty.

Step 3

Heat the oil in a large non-stick frying pan over medium heat. Cook half the patties for 3-4 minutes each side or until browned. Transfer to a plate. Repeat with the remaining patties.

Step 4

Spread the bases of the rolls with the mango chutney. Top with the salad leaves, patties, tzatziki and cucumber. Top with the remaining rolls.