Although this is wonderful fresh, I'm stocking up as much as I can for winter soups and frittatas.
I steam it for a few minutes, and followed the directions found at Mother Earth News online page (regarding harvesting purslane).
I cooled it per their instructions as well, to not wash off the vitamins and minerals - filling a metal bowl with ice water, putting an empty one in the ice water, and cooling the steamed purslane.