Soak lentil in cold water for 2 hours, then drain the water.

Pour prepared lentil with stock and cook until softens.

Cut onion into half-rings, sauté in oil until golden.

Cut potatoes into cubes, fry flour, chop nuts and fry.

Put potatoes in the soup, add onion, prunes, flour, nuts, salt, pepper and cook until done.

When serving, put beef pieces in plates, pour the soup and season with greens.