* 6 bone-in short ribs (about 5 3/4 pounds)
* Kosher salt
* Extra-virgin olive oil
* 1 large Spanish onion, cut into 1/2-inch pieces
* 2 ribs celery, cut into 1/2-inch pieces
* 2 carrots, peeled, cut in 1/2 lengthwise, then cut into 1/2-inch pieces…
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