Onions peel and in small cubes cut. Wash the lentils and put them in a pot. Add bacon, onions and 1 1/2 litres of water, bring to the boil and cook for 45-60 minutes. Peel and wash carrots and cut them into small cubes.
Add to the lentils after 20 minutes. Wash the parsley, shake dry, pluck the leaves from the stalks and chop them except for something to garnish. After 30 minutes, remove the bacon and cut into cubes.
Approx. 10 minutes before cooking, prepare spaetzle in boiling salted water according to the instructions on the packet. Heat the oil in a pan and fry the bacon in it. Drain the spaetzle. Season the stew with salt, pepper, vinegar and sugar.
Add chopped parsley. Arrange the stew, put the spaetzle in the middle and sprinkle with fried bacon. Garnish with parsley.