Add 1 tablespoon of flour to the roasted onions and continue the roasting process until the smell comes out and turns color. Transfer one carrot and one potato, which you cut into large pieces, into the pot and continue mixing.
After washing with salt, pepper and plenty of water, add 1.5 cups of drained lentils and mix well for the last time.
Add 6 cups of hot water to the pot.
Then close the lid and cook for 40 minutes, stirring occasionally, until the potatoes and carrots are soft.
In order for the soup to get a smooth consistency after cooking; through a hand blender. After cooking for another 5 minutes, remove from the stove.
Heat 3 tablespoons of oil and 2 tablespoons of butter in a pan. Add 1 teaspoon of ground red pepper on it and after heating the oil for 2 minutes, remove it from the stove.
Take the soup in a bowl and pour the oil you have heated on it and serve.