Place pears in a large saucepan and just barely cover with water. Simmer over medium-low heat until tender, 15 to 20 minutes.
Run cooked pears through a food processor or blender till smooth. Serve once cool, or freeze for later.
To freeze for later: fill an ice cube tray with the pear puree. Freeze for at least 2 hours, till solid. Remove cubes from tray and place in a freezer bag. To defrost, place in microwave for 30 seconds, or as needed.