Simmer pears, covered in a large saucepan with 1/3 cup water until tender, 5 to 10 minutes. Drain; reserve cooking liquid. Transfer pears to a blender. Working in small batches, blend until smooth. Add reserved liquid if needed. Pass through a fine sieve for a smooth texture. For a coarser texture, mash with a fork. Fill 1/4-cup plastic containers or ice cube trays with puree.
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