Bring the ginger and water to a boil in a pot and simmer uncovered for about 10 minutes. Remove from the heat. Strain the ginger water into a large saucepan and discard the ginger slices.
Peel and core the pear, then slice it into disks. Stud 3–5 black peppercorns into the edges of each disk, pressing them in firmly so they do not fall out during cooking.