Is the company's profit potential as big as Chipotle's?When it comes to investing in restaurant stocks, Chipotle Mexican Grill (CMG 3.45%) is the gold standard. A $10,000 investment when the company went public in 2006 is worth over$600,000 today. Its operating profit is up about 4,000% since going public, which is a big reason for its sensational returns.These sensational returns have investors constantly looking for the "next Chipotle," and salad-centric chain Sweetgreen (SG 4.04%) is commonly seen as a ...