Heat oil in a pan and fry onion, carrot, celery, and garlic for approx 5 mins.
Now add sweet potato, curry powder, cumin, and paprika powder and stir for a further minute.
Add the lentils & water. Bring to the boil for approx. 25 mins.
Transfer the mixture to the mixing bowl and add breadcrumbs and egg now stir until combined.
Divide the mixture to form 4 patties. Heat the oil and cook the patties for 4-5 mins until golden brown
You can bake these burgers in the oven as well
Serve in Hamburger Bun with tomatoes, onion rings and salad.