In a large saucepan over medium-high heat, add the cinnamon, cloves, peppercorns and allspice and allow to heat up until fragrant, approx. 1-2 minutes. I like to remove the spices, except cinnamon, and place them inside a tea strainer so they're not floating around and easier to remove. You can leave them in if you don't have a way to do this. I then place the tea strainer with spices back in the saucepan. Pour apple cider into pan and bring to a boil, increase heat if needed. Reduce temperature once boiling and simmer over medium-low heat for 20-30 minutes. Remove spices from pan and serve hot.