When travelers think of Shandong cuisine, sweet and sour pork or Peking duck often come to mind. But there's a hidden gem in this coastal province that food lovers are missing - Su Guo (酥锅 sū guō), a slow-cooked masterpiece that embodies the soul of Shandong home cooking. What Makes Su Guo Special? Imagine walking into a Shandong grandmother's kitchen during winter. The rich aroma of vinegar, soy sauce, and spices fills the air as a giant pot simmers for hours. That's Su Guo - a traditional "everything but the…