Sharpness test with food items?

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Jan 16, 2017
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Besides the old stand-by of an over-ripe tomato, what food items have you found to be a good sharpness test?

Roma tomatoes seem to have a thicker skin, but they're also pretty small. The "regular" red tomatoes (approx 3.5" diameter), when you slice them very thin, produce a fairly fragile slice that seems to be a pretty good test to see if you can make a full slice without any tearing.

Potatoes are OK, but the problem with those, with a non-dimpled knife, is the vacuum created from the juices as you slice causes a slicing resistance that has little to do with the sharpness. But if you first cut in half and then just do very thin "potato chip" slices with just a downward push motion, the resistance seems more proportional to sharpness.

What other food items do you guys like to use (including meats, not just fruits and vegetables)?
 
Gourds and melons and how a knife transitions between the hard rind and soft flesh. And if rock chopping produces clean separation through herbs such as cilantro.
 
3 stalk bunch of broccoli shrink wrapped from Publix. Test is weight of the blade slicing through the shrink wrap, 3 stalks, and shrink wrap in one pull stroke. Only 2 knives have ever passed, both O7 (1.2519) Pairing knives from @samuraistuart
 
I love hot peppers, so am always slicing a jalapeno to put in my food. How my pocketknife du jour performs that small chore is a nice quick "test".

Just noticed---that fits well with OP's screen name. :D

Andrew
 
I love hot peppers, so am always slicing a jalapeno to put in my food. How my pocketknife du jour performs that small chore is a nice quick "test".

Just noticed---that fits well with OP's screen name. :D

Andrew
Now that you mention it...I don't buy them that often, but Poblano peppers have a bit more leathery skin and are a decent test. Also, freshly roasted and de-skinned Anaheim chilies can be a bit of a challenge to slice (crosscut) since the flesh takes on a completely different and firmer texture after roasting, and they become a bit slippery as well.
 
I like testing on some nice big russet potatoes. Dull knife makes cutting them up a chore. Sharp knife slices them with ease
 
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