• In a large bowl combine onion, gochujang, ginger, garlic, soy sauce, sesame oil, sesame seeds, and sugar. Mix well to combine all ingredients.
• Add beef to marinade. Coat the beef well and then cover with a lid or saran wrap. Marinate for 2 to 8 hours.
• Spray slow cooker with cooking spray and then place meat and remaining marinade in slow cooker on HIGH for 4 to 5 hours or LOW for 6-8 hours or until beef is cooked through.
• After meat has cooked thoroughly, mix two Tablespoons of cornstarch with 1 1/2 Tablespoons of water.
• Stir cornstarch mixture into the remaining juice's and marinade. Stir frequently until it begins to thicken.
• Preheat oven to broiler setting.
• Cover a cookie sheet with foil and spray with cooking spray.
• With a slotted spoon remove meat from slow cooker and place on covered cookie sheet.
• Place meat under the broiler for 3 to 5 minutes or until the meat is slightly charred.

Gochujang Mayo

• In a medium bowl combine all the ingredients and mix well. Store in airtight container.

To Serve

• Serve meat over sushi rice.
• Pour thickened sauce over meat.
• Drizzle gochujang mayo over the meat.
• Sprinkle with green onion and more sesame seeds if desired.