When pureeing hot soup, an immersion blender is a handy tool. You can puree right in the pan with little or no extra mess.
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Hot soup (or other hot liquids, for that matter) will steam and expand in the blender, which can push the top off and cause a mess and burn hazard.
When pureeing hot soup, do it in batches. Fill the blender 1/3 to 1/2 full, remove or loosen the center cap from the lid of the blender. Cover the lid with a folded dishcloth and hold it down when blending. Repeat with the remaining batches.