Peel the onions and ginger, chop both finely and stew in the hot oil for about 2 minutes, if necessary add diced chilli peppers, but be careful, the ginger already gives a certain spiciness. Roast the spices briefly, then add the lentils and pour the broth on top. Cover and simmer for approx. 10 minutes.
In the meantime, cut the tomatoes crosswise, pour boiling water over them, peel, quarter, core and dice. Add to the soup, bring to the boil and season again to taste.