1 cinnamon stick, 1 teaspoon allspice berries, ½ teaspoon whole cloves
Use scissors to cut a rectangle of cheesecloth that’s about 6-by-9 inches in size. Place the cinnamon stick, allspice berries, and whole cloves in the middle of the cheesecloth, then gather up the sides to form a little bundle. Tie the bundle closed with kitchen twine.
1 (20-24 ounce) jar sliced peaches in syrup, 1 tablespoon granulated sugar, 1 teaspoon apple cider vinegar, Pinch ground nutmeg
Pour the peaches and their syrup into a medium saucepan (you can save the jar for step 6, if you like). Taste a little bit of the syrup; if it’s not very sweet, add the optional sugar (and if it is very sweet, skip it!). Add the vinegar, nutmeg, and spice bundle.
Bring the mixture to a boil over medium heat (big bubbles will vigorously break all over the surface). Turn off the stove and slide the saucepan to a cool burner. Let sit until the mixture cools and the flavors blend, at least 30 minutes.
Use tongs to remove the spice bundle from the pot, squeezing out any extra juice; discard the spice bundle.
Carefully pour the warm peach mixture into a blender jar. Place the lid on the blender and hold it in place with a kitchen towel. Blend the mixture until smooth, about 30 seconds.
Pour the peach nectar into the now-empty peach jar (or another container of your choice). Serve now while it’s warm (like in the book!) or put the lid on the jar and refrigerate for up to 1 week.