Rick Mahan was shaping hand-rolled pizza dough for Friday's lunch rush at his newest restaurant, One Speed, when a customer brought in tomatoes fresh from the garden. The plump red fruit later found its way onto a Caprese salad -- almost as quickly as pizza had made its way into the chef's heart. Mahan said he's been dreaming about creating a pizza place since opening The Waterboy in Midtown nearly 13 years ago. "I've never gotten over my pizza fascination," said Mahan, one of two pizza cooks cranking out pie after pie. "For me, the most satisfying thing to cook from start to finish is pizza. I've cooked everything over the years and I've loved it. This is proving to be a very satisfying