Boil the cubed potatoes until tender, then drain and mash them.

In a pan, sauté onion and garlic until translucent. Add spinach and lentils, season with cumin, salt, and pepper, and cook for a few minutes.

Mix the mashed potatoes with flour, salt, and pepper. Form into patties and stuff with the lentil mixture.

Heat oil in a frying pan over medium heat. Fry the cakes until golden brown on both sides.