For 4-6 servings:
Clean the carrots carefully under running water, using a special brush; allow to dry. Clean the celery. Finely chop the onion and garlic and place in a pot with oil and rosemary. Sauté over a rapid heat. Slice the carrots lenghtwise and finely chop the celery. Add both to the pot, add the sesame seeds, a pinch of salt, and after a few minutes, lower the heat, cover and continue cooking for about 15 minutes, stirring from time to time so the mixture doesn’t stick.
Cook the pasta in plentiful salted water; when al dente drain and mix into the sauce. Toss over the heat for a few seconds. The success of this recipe largely depends on the carrots: they should be al dente: cooked, but still firm.