This weed comes up everywhere on my property wherever I have bricks or stones.  It’s coming on strong right now here in VA.  Purslane is easy to prepare - just rinse it off and eat it!  It’s crunchy and tasty, kinda like a crunchy arugula with a hint of lemon.  Use it as is or add it to a salad.  It’s free, full of vitamins, and yummy.
...Tom