Instant Pot Chicago-Style Italian Beef Sandwiches Recipe

Ingredients

• 1 Boneless beef chuck roast ((4 pounds))
• 1 teaspoon salt
• ¾ teaspoon pepper
• 2 Tablespoons olive oil
• ½ pound fresh mushrooms
• 2 celery ribs (roughly chopped)
• 1 medium onion (cut into a few wedges)
• 6 garlic cloves (minced)
• 1 teaspoon dried thyme
• 2 teaspoon dried oregano
• 4 cups beef broth
• 1 Tablespoon beef base ((https://amzn.to/3gYwv3g))
• 12 Italian rolls (or French rolls, split)
• 1 jar giardiniera ((16 ounces), drained)