Peel and finely chop the onion. Clean, wash and also finely dice the greens. Heat the fat in a pot and fry the vegetables and the diced onion. Add the lentils, fry briefly and deglaze with the stock.
Let it boil at low heat for about 30 minutes, stirring occasionally. Add the pasta to boiling salted water and cook for eight minutes. Put cream in a small pot, bring to the boil and season with ginger, salt and pepper.
Drain the pasta and fill with the lentil vegetables. Spread the sauce on four ovenproof dishes, place six filled pasta in each and sprinkle with the cheese. Bake under the hot grill of the oven until golden brown.