Winter Beef Stew

Ingredients

• 4 Tbsp olive oil, divided (plus more if needed)
• 1 lb stew beef, cut into 1-inch pieces
• 2 Tbsp all purpose flour
• 1 tsp kosher salt
• 1 tsp black pepper
• 1 large yellow onion, chopped
• 4 cloves garlic, minced
• ½ lb trumpet, oyster, or shiitake mushrooms, chopped
• 2 carrots, peeled and chopped
• 2 parsnips, peeled and chopped
• 1 small rutabaga, peeled and chopped
• 1 small celery root (celeriac), peeled and chopped
• 1 medium burdock root, peeled and chopped
• (about 2 ½ lbs root veggies, total)
• 1 (16 oz) can stout
• 2 cups beef broth
• 2 Tbsp worcestershire sauce
• 2 sprigs rosemary leaves, minced
• 1 tsp dried thyme
• ½ tsp red chili flakes (optional)