Clean the pointed cabbage, quarter it, cut out the hard stalk. Wash potatoes thoroughly. Put the cabbage quarters upright in a large high pot (must still be able to be closed with a lid). Spread potatoes around it. Pour on cream and stock, cover and steam over medium heat for about 40 minutes.
Wash the chervil and dab dry. Pluck the leaves from the stems and chop them, except for a little bit for garnishing. Remove potatoes and cabbage. Mix starch with a little water, boil up cabbage stock, thicken with starch, season with salt, pepper and a little nutmeg and stir in chervil. Arrange potatoes, cabbage and sauce on plates, garnish with chervil