Onion Vs Shallots: What's The Actual Difference? - Tasting Table
Briefly

"Onions and shallots are not interchangeable. Even so, they both serve as the foundation of much of global cuisine, sautéed or served raw, caramelized or crispy..."
"The chief differences that make shallots unique from onions are their textures, flavors, and subsequent uses in cooking. Shallots are milder and more tender, while onions are sharper and don't break down as easily."
Read at Tasting Table
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