Preheat oven to 375°F. Arrange 8 slices of bacon on a broiler pan and bake until crisp, 12-15 minutes. Finely chop the remaining bacon.
In a skillet, heat a drizzle of EVOO over medium-high heat. Add the butter to melt. Add the onion; season with salt and pepper. Cook until softened, about 15 minutes. Add the cider, syrup and Worcestershire, and simmer at a rapid but controlled bubble, stirring frequently, for 8-10 minutes.