Pot Roast with Mashed Potatoes Recipe

· 2 tablespoons tomato paste

· 1 cup dry red wine (like Cabernet Sauvignon or Merlot) or additional beef broth

· 2-3 cups low-sodium beef broth

· 1 tablespoon Worcestershire sauce

· 2-3 sprigs fresh thyme (or 1 tsp dried)