Peel and slice the carrots. Peel and chop the onions. Heat the fat in a pot and fry the onions in it. Add the carrots and deglaze with the broth. Bring to the boil and cook for 15 minutes.
Put the pasta in plenty of boiling salted water and cook for 10-12 minutes. Finely puree the carrots with the cutting stick of the hand mixer. Season with salt, pepper and cayenne pepper. Roast sesame seeds until golden brown.
Cut off the cress briefly. Drain the pasta and arrange on plates with the carrot sauce. Sprinkle with sesame and cress.