Korean Beef Lettuce Wraps

• 1 pound ground beef
• 1/2 medium onion diced
• 1 can water chestnuts drained and diced

For the Korean sauce

• 1/4 cup soy sauce
• 2 tablespoons brown sugar
• 2 cloves garlic pressed
• 1/2 tablespoon minced ginger
• 1/2 tablespoon sesame oil
• 1/2 teaspoon garlic powder
• 1/2 teaspoon onion powder
• 1/4 teaspoon crushed red pepper flakes
• 2 teaspoons corn starch
• 2 teaspoons water

For the lettuce wraps

• 1 head butter lettuce
• 1 cup shredded carrots
• 3 green onions sliced
• 1/4 cup spicy mayo
• Yum yum sauce