Political prisoners swallow their pride (and maybe some poison) in Rivendell's world premiere. The gulags in Meghan Brown's world-premiere dystopian fable, The Tasters, resemble plenty of real-world hellholes that confine political prisoners, save for their spectacular dining options. Chained to metal desks, three captives (Daniella Pereira, Paula Ramirez, Shariba Rivers) sample extravaga…