The sirloin steak was sour. I initially suspected that the taste was affected by the drink, but the more I ate, the more I felt that the steak was indeed sour. The boss explained that the steak production process was different, and this batch of sirloin steaks was sour. Three or four customers had complained that the steaks were sour, and the boss said it was normal. He also said that steaks are not sour in such a hot summer, and this batch is a problem with the production process, and it is guaranteed that there is no deterioration. However, I do not accept this explanation. The batch problem means that there is a problem with the production of this batch of steaks. If you like sour steaks, you can order sirloin steaks.