Pappardelle With Slow Cooker Beef Ragu

Name: Pappardelle With Slow Cooker Beef Ragu
Ingredients: 2 lb. boneless chuck roast, cut into 2-in. pieces; 2 1/2 tsp. kosher salt, divided; 1 Tbsp. olive oil; 2 medium carrots, peeled and chopped (about 1 cup); 1 medium yellow onion, chopped (about 1 1/2 cups); 4 medium cloves garlic, finely chopped (1 1/2 Tbsp.); 2 tsp. chopped fresh oregano, plus more for garnish; 1 cup dry red wine or beef broth; 1 15-oz. can whole peeled plum tomatoes; 12 oz. pappardelle pasta; Grated Parmesan cheese, for garnish