The Store-Bought Shortcut Ina Garten Refuses To Buy - Tasting Table
Briefly

"I actually always grate Parmesan myself, because when you buy it grated, you have no idea what you're getting. It could be something like Parmesan, and you want the real thing."
"When you buy pre-shredded cheese, you can't be certain whether a lesser grade of Parm has been used and how long it's been sitting in that packaging."
"The entire process takes less than a minute because the internal blades are sharp enough to whizz through the hard texture of the cheese."
"The beauty of shredding your own Parmesan is that you can control the final texture of the strands, achieving a super fine grind or thick shreds."
Read at Tasting Table
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