Hot soup can sit inside a blender without looking dangerous, but the moment the blades start spinning, everything changes. Steam escapes from the liquid, soup rushes up the sides, and pressure can build beneath the lid. If that steam has nowhere to go, it can force the lid upward and send scalding soup across the kitchen. The mistake isn’t blending hot food. It’s trapping steam inside a container while the blades are running.
The solution isn’t leaving the lid loose. It needs to stay secure while steam escapes through the vent designed for that purpose.
Hot soup can build pressure inside the blender
Soup continues releasing steam after leaving the stove, even when the surface appears calm.
Once the blender starts, the spinning blades create a vortex that moves hot liquid through the jar. That movement releases steam faster and pushes soup toward the lid.
If the lid traps the steam, pressure can build above the liquid.
Starting at high speed makes the situation worse. The sudden movement sends soup upward before the pressure has time to escape.
That small opening in the lid has a purpose
Many countertop blenders have a removable center cap in the lid.
When the manufacturer permits blending hot liquids, that opening can provide a route for steam to escape.
Remove the center cap if the blender’s instructions call for it, then drape a folded kitchen towel over the opening to catch splashes without sealing the vent.
Keep the lid secure and hold it through the towel, with your hand away from the opening.
Don’t press your palm against the vent or stuff the towel inside it. Steam needs a clear route out.
Some blenders have built-in vents or different requirements, so follow the instructions for your model.
Never fill the blender more than halfway with hot soup
An overfilled blender leaves little room for the liquid to move.
When the blades start, soup rises along the sides of the jar. Steam also needs space above the liquid before escaping through the vent.
Fill the container no more than halfway and blend larger batches in portions.
That extra space helps reduce the risk of soup reaching the lid, but it doesn’t replace proper venting.
Check that the blender and its jar are rated for hot liquids before using them. Many sealed personal blender cups aren’t designed for this job.
Start on the lowest speed, not the highest
Even with a vented lid, starting at full power can send hot soup surging upward.
Set the blender to its lowest speed and let the liquid begin moving before increasing the power.
Raise the speed in stages rather than jumping straight to high.
If the soup is still bubbling from the stove, let it cool somewhat before transferring it.
Once blending is finished, wait until the blades stop before opening the lid. Lift it away from your face to avoid escaping steam.
An immersion blender avoids transferring hot soup
There is another option if you don’t want to pour hot soup into a countertop blender.
An immersion blender can purée soup inside the cooking pot.
Keep the blade submerged while blending to reduce splashing, and avoid lifting the running blade above the surface.
The method works for vegetable soups, cooked sauces, and other hot mixtures that need a smooth texture.
The same mistake can happen with hot sauces
Butternut squash soup isn’t the only food that can build pressure inside a blender.
Cooked tomato sauce, roasted pepper sauce, hot chile mixtures, and warm vegetable purées can create the same problem.
Any hot mixture releasing steam needs the same precautions when blended in a countertop jar.
A secure lid is important, but a lid that traps steam can turn an ordinary cooking step into a burn hazard. Leave enough room in the jar, use the manufacturer’s venting method, and start the blades at low speed. The goal is to keep the soup moving inside the blender while giving the steam somewhere else to go.
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