Wash the green asparagus and cut off the woody ends. Cut cauliflower into florets from the stalk, wash and cut smaller according to size. Cook in boiling salted water for about 5 minutes. After about 2 minutes add the asparagus.
Pour the vegetables into a sieve.
Heat butter in a pan and roast sesame seeds briefly in it. Toss the asparagus and cauliflower in it. Season with salt.