Cook the lentils and rice as per the packs instructions.
Heat a little oil in a frying pan. Add the onion and sauté for about 3 minutes, until soft. Add the garlic and cook for another 2 minutes until soft but not browned.
Place the lentils, the rice and the remaining ingredients, except the egg, in a bowl and mix well. Whisk the eggs in a separate bowl and then add to the rest of the ingredients. This will help bind the mixture.
Take a couple of tablespoons of the mixture and, using your hands, shape into a baby-sized veggie burger. Repeat until you have 8 burgers. Then divide the remaining mixture into 4 and shape these into larger burgers.
To cook the burgers, heat about 1 tablespoon of rapeseed oil per batch in a frying pan over a medium heat. Place a few burgers on the pan and cook for about 4 minutes. Then flip them over and cook for a further 4 minutes the other side. They should be lovely and golden brown.
To serve, place each burger on a bun, top with a little thinly sliced sweet onion, sliced tomato and some Cajun sauce. Add some potato wedges and salad on the side.