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
2 cloves garlic, smashed
1 1/2 cups tomato paste
2 to 3 cups hearty red wine
2 cups water
1 bunch fresh thyme, tied with kitchen string
2 bay leaves