AVALON PARK — It’s a muggy Friday evening, and The Watermelon Man has his truck bed parked at the corner of 83rd Street and Stony Island Avenue.
A small crowd forms near a pyramid of watermelon arranged on a tarp. Drivers slow their cars at the busy intersection and toss questions about the melons from rolled-down windows.
The Watermelon Man shuffles through the transactions like a Vegas croupier…