A ticket to the Alley Theatre’s production of Seared in Houston comes with an unusual notification: an allergen warning. “We’re cooking live on stage,” it reads, “including salmon. Please contact Guest Services if you have concerns about your food allergies before purchasing tickets.” The drama by New York playwright Theresa Rebeck, which had its premiere in 2016, takes place in a restaurant kitchen, where the relationship between a passionate chef and his finance-focused business partner becomes strained when the partner brings on a consultant.The set of Seared, which runs February 7 to March 12, is a functional kitchen, and actors cook real food during the performance. But in the era of Top Chef and The Bear, audiences would be able to spot sloppy knife skills…