Whenever you're planning to cook a big batch of greens (collards, mustards, kale, etc.), dedicate a couple of clean kitchen towels for their prep.

First, fill a large bowl with cold water and submerge the greens. Swish them around in the water, lift them out and repeat with another bowl of clean water. Then spread 2 large kitchen towels onto the counter, overlapping end to end. Lift the greens out of the water and shake them to remove some of the excess water. Then line the greens up on top of the kitchen towels and roll them up.

If you're not ready to cook them, just put the big cylinder of greens into the refrigerator — the moist towels keep them fresh.