Slow-Cooker Korean Beef

Ingredients (14)

• 1/2 cup packed brown sugar
• 1/3 cup gluten-free tamari soy sauce
• 1/4 cup Sriracha chili sauce
• 3 tablespoons minced garlic
• 3 tablespoons minced fresh gingerroot
• 2 tablespoons rice vinegar
• 1 tablespoon fish sauce or additional soy sauce
• 1 tablespoon sesame oil
• 1/2 teaspoon crushed red pepper flakes
• 1 boneless beef chuck roast (4 pounds)
• 1 medium onion, chopped
• 4 tablespoons cornstarch
• 1/4 cup reduced-sodium beef broth
• Optional: Hot cooked rice and sliced green onions