To understand The Grove, the 575,000-square-foot shopping Xanadu in central Los Angeles, let its owner, Rick Caruso, introduce you to its neighbor, the iconic Farmers Market. He takes you to a butcher stall where, some 80 years ago, Caruso’s father was sweeping the floor. Next he points to a pizza stand founded by Patsy D’Amore, who baked L.A.’s first pie in 1939. “I grew up on his knee,” he says. Dapper in a custom suit and red-and-black-striped tie, Caruso weaves his way through the chaos, frequently stopping to ask merchants, “How’s business?…..