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["Preheat oven to 325u00b0F. Butter a 13x9x2"" baking dish.", "Arrange bread cubes in a single layer on 2 rimmed baking sheets. Toast, stirring occasionally, until dry and crisp, 25-30 minutes. Let cool, then transfer to a very large bowl.", "Meanwhile, bring cider to a boil in a large wide pot and cook until reduced to 1 1/2 cups, about 40 minutes. Remove from heat and set aside.", "Bring raisins, vinegar, and 2 Tbsp. water just to a simmer in a small skillet over medium heat to warm through. Transfer to a small bowl; let cool, then drain.", "Cook bacon in a 12"" skillet over medium-high heat, stirring occasionally, until brown and crisp. Using a slotted spoon, transfer to paper towels to drain (do not wipe out skillet).", "Heat 1/4 cup butter in same skillet over medium-high until melted. Add chopped celery stalks, apples, shallots, garlic, thyme, salt, and pepper and cook, stirring occasionally, until tender, 10-12 minutes.", "Add celery mixture, celery leaves, raisins, bacon, and parsley to bread cubes and toss to combine. Mix in reserved cider and 1 1/4 cups broth.", "Beat eggs in a small bowl, then stir into stuffing; add more broth if stuffing is dry. Transfer to prepared baking dish. Bake stuffing until cooked through and golden brown on top, about 1 hour.", "Stuffing mixture can be prepared up until step before adding the eggs 1 day ahead; cover and chill."]