Boil a few potatoes. Fry some finely cut onion in olive oil. Roughly cut raapstelen (Brassica rapa).
Mash potatoes roughly (add a little water or milk). Add onion-olive mixture and raw raapstelen. Add salt and mix. To enjoy the vegetable best, use just two medium sized potatoes for 200 gram raapstelen. Use the heat of the potatoes to soften the leaves a little.