The company's operating profitability is much higher when it uses machines to make its salads.Would you let a robot make your salad?For customers at a pair of Sweetgreen (SG 5.16%) restaurants, the answer is a clear "yes." At both outlets, the company is road-testing an automated system called Infinite Kitchen. This sets Sweetgreen apart from its peers in the hotly competitive fast casual space; while many are seeking to adapt AI to their operations, Sweetgreen is already using the technology to get food to ...