It used to bother me that beets would bleed their red color into other ingredients that they touch, and I omitted beets from my salads for a long time. How much I missed the sweet taste. Now I accept the running colors as a trade-off. You can sprinkle diced beets on top of a salad just before serving to keep the other ingredients from discoloring. I like penne in this salad, but if you have other cooked pasta in the fridge use it instead.