Instant Pot Irish Guinness Beef Stew

Ingredients (18)

• 2 tbsp vegetable oil
• 2 - 3 lb boneless beef stew meat
• Kosher salt and freshly ground black pepper
• 8 oz white button mushrooms
• 2 11.2 fl. oz. bottles Guinness Stout beer
• 1 cup beef stock
• 1 yellow onion
• 3 garlic cloves
• 2 tbsp Worcestershire sauce
• 1 tbsp whole grain mustard
• 1 sprig fresh thyme
• 1 bay leaf
• 1/2 tsp Kosher salt
• 3 medium carrots
• 6 small red potatoes
• 1 cup frozen pearl onions
• 2 tbsp cornstarch
• 2 tbsp water