Wash, peel, and core the pears and then cut into chunks.
Add the cut-up pear chunks and 1/2-cup of water to a heavy-bottomed saucepan or a Dutch oven.
Simmer the pear pieces over medium heat until softened, anywhere from 30-50 minutes.
Blend the pears and concentrated juice with a stick blender or process using food mill — the pear sauce can be chunky or smooth.
Carefully ladle the hot pear sauce into a prepared 1-pint jar, leaving 1/2-inch headspace.
Wipe the jar rim and apply two-piece lids until fingertip-tight; load the jar into the canner and process for 15 minutes (or see chart below).
Turn off water bath canner and let the pear sauce rest in the hot water for 5 minutes before removing.
Let the pear sauce cool to room temperature (about 12 hours) and then check the seal of the jar. Store unsealed pear sauce in the refrigerator and use within a week. Store sealed pear sauce in a cool, dark place away from direct light — enjoy within 18 months.