Add the potatoes and bay leaf to a stock pot and fill the pot about halfway with water. Salt the water, and bring the water to a boil.
Meanwhile, place the cauliflower florets in a heat-safe container (or, many varieties come packaged in microwaveable bags) and microwave until completely thawed.
When the potatoes are tender and easily pierced with a fork, add the thawed cauliflower to the pot. Turn off the heat. Drain the potatoes and cauliflower, and remove the bay leaf.