Found a new recipe, and it called for blending two (average sized) tomatoes, about a tablespoon of grated ginger (15 grams let's say), and four grated garlic cloves. Blended it all, everything fine.

When it was time to use the blended result, I expected it to come out of the blender jar like a (thick) liquid, but instead it just stayed in the jar. It actually acted liked beaten egg whites (clinging to the container), and structurally looked quite like a mousse. When I scooped out the "mousse", upon touching the heat of the pan, it dissolved immediately into liquid components again.

Is this a known property of blending tomato, ginger, garlic in a blender (or any "high speed" mixing device for that matter) together? Or a combination of those components?


If it helps, I used multiple smaller sized tomatoes to make up for one "average" tomato. So more tomato peel was involved, if that matters. Weights for the tomatoes were not given, but the replacements I used quite accurately match what I would consider "An Average Tomato".

  • I'm not sure but I think it may be the tomato by itself... I feel like I've heard odd things about the structure of tomato water/juice.
    – Catija
    Mar 29, 2017 at 18:19
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    Most vegetables or fruits, when blended without additional liquid, produce a puree that's too thick to flow out on its own. Is this somehow different from what happened to your tomatoes? How was the mousse different from other blended vegetables?
    – rumtscho
    Mar 29, 2017 at 19:12
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    @rumtscho: Normally when I blend tomatoes, it produces a slightly thick liquid that you can just pour out of the container. The structure in this case was such that you could actually hold the container up side down without it falling out, or even drip. Mar 30, 2017 at 5:02
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    Whatever you made displays a property known as "thixotropy". Usually ketchup is notorious for it, plain tomato sauce/puree much less so... Mar 30, 2017 at 10:17
  • @rackandboneman. does this explain 'tomato ketchup' (which personally I hate)? Mar 30, 2017 at 11:28

1 Answer 1


I suspect the culprit is the tomato, which does a good job taking on air and looking 'foamy'. I've noticed this if I use my stick blender when making pasta sauce from a few jars of canned tomatoes as well as when I make gazpacho. Even a few short bursts in a blender can whip up the contents.

A food processor, which typically has a flat blade, won't incorporate as much air as the blender, rather it's going to chop vs. whip.

Also, love how you asked about 'why' vs. expressing disgust at the result. Probably makes no different in the final result as the heat of cooking will take care of the foam, as will time.


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