Soak the red lentils in water for at least 3 hours. You can also soak them for longer if needed — in that case, it's best to refrigerate them while soaking. After soaking, rinse well and drain thoroughly.
If baking the patties, preheat the oven to 180°C / 350°F and line a baking sheet with parchment paper. Lightly spray the parchment with oil.
In a food processor, combine the onion, carrots, cilantro (including stems), curry powder, salt, and black pepper. Pulse until finely chopped and crumbly.
Add the soaked lentils, rolled oats, and baking soda to the food processor. Process for about one minute, until smooth.
Form the mixture into patties about 5 cm /2-inches in diameter.
For baking: Place the patties on the prepared baking sheet and bake for 20–25 minutes until fully set.For frying: Heat about 2 cm/¾ inch of oil in a skillet. Carefully add the patties and fry for about 2 minutes on each side until golden and crispy. Avoid moving them during the first 2 minuter of frying to prevent breaking - they will firm up as they cook.
Serve with tahini or any other sauce if desired.
Notes:
You can substitute the carrots with one medium sweet potato (about 250 grams).
Since the oats are blended, you can use either regular or quick oats.