LISBON — While the Portuguese say “Quem tem boca vai a Roma,” or “Whoever has a mouth goes to Rome, Julius Caesar probably would have encouraged those with a mouth to go to Lisbon. A century before Christ, the Roman dictator used to order — before delivery apps and internet orders — from his marble office in the Forum, in the shadow of the Colosseum, a special sardine-based sauce produced in the sunny coastal city of Olisipo (modern-day Lisbon), in the distant Roman province of Lusitania. The condiment is called garum. ✉️ You can receive our Bon Vivant selection of fresh reads on international…