Korean Beef Bulgogi in Lettuce Wraps

Name: Korean Beef Bulgogi in Lettuce Wraps
Ingredients: 5 tablespoons soy sauce; 5 tablespoons water; 5 tablespoons sugar; 1⁄4 cup onion, peeled and pureed; 5 garlic cloves, minced; 1 tablespoon corn syrup; 2 teaspoons white wine (rice wine) or 2 teaspoons mirin (rice wine); 1 tablespoon sesame oil; 1⁄2 black pepper; 2 1⁄2 lbs flank steaks (other steak such as marinating beef, rib eye etc will also work); 1 head iceberg lettuce (or other leaf lettuce); toasted sesame seeds; roasted whole garlic clove; red pepper paste or hot sauce