Slow Cooker Irish Beef Pot Roast

Name: Slow Cooker Irish Beef Pot Roast
Ingredients: 2 lb. boneless beef chuck roast, cut into 2-inch pieces; 1 Tbsp. plus 1/4 tsp. kosher salt, divided; 1 Tbsp. neutral oil (such as canola); 2 Tbsp. tomato paste; 3 medium garlic cloves, finely chopped (about 1 Tbsp.); 1 14.9 oz.-can Irish stout (such as Guinness); 1 1/2 lb. baby gold potatoes, halved; 3 large carrots, cut on a diagonal into 2-inch pieces (about 3 cups); 2 tsp. cornstarch; 2 tsp. Worcestershire sauce; 2 Tbsp. chopped fresh flat-leaf parsley, for garnish