• In a saucepan add rinsed dried lentils along with the water. Bring lentils to a boil, then lower the heat to medium and cook covered for 20 minutes. Drain water and rinse the lentils with cold water.
• Preheat a skillet over medium heat and add 3 tbsp of olive oil. Once heated, add the grated onion and the grated carrot. Cook for 3-4 minutes, stirring occasionally or until the onion and carrot are softened. Add the diced garlic and stir for another minute. Transfer the mixture to a bowl.
• In a food processor, add the oats and pulse them 2-3 times for a couple of seconds. Then add the cooled, drained lentils, the carrot mixture, followed by the egg and seasonings.
• Pulse the mixture a few times, then transfer it into a large bowl and mix it lightly with your hands.
• Preheat a nonstick pan over medium heat and add olive oil in just enough to cover the bottom of the pan. Form the patties and fry on each side for around 4-5 minutes. Once you turn the patty on the other side, add the slices of cheese and cook the another 4-5 minutes.

Spicy mayo:

• Add all the ingredients for the spicy mayo sauce in a bowl and mix to combine.

Assimble:

• Optional but absolutely recommended: Preheat a nonstick skillet and add olive oil; toast the burger buns. To the same skillet, add a few 1s/2inchesh or 1cmm slices of onion and fry them on both sides for 30 seconds to around a minute.
• Add the spicy sauce on the top and bottom bun. Add lettuce on the bottom bun, followed by the lentil burger, and top with the grilled onion and sliced tomato.
• Add the top burger bun on top, serve and enjoy!