Peanut sauce: combine all ingredients in a bowl. Whisk in hot water until the desired consistency is reached.
Processed ingredients: combine all ingredients in a food processor until it turns to a smooth paste consistency.
Heat the oil in a wok. Add in the processed ingredients, lime leaves, soy sauce, and one tablespoon of sweet soy sauce. Cook for 3-5 minutes until everything blends together.
In a bowl, add in ground beef, egg, and processed ingredients. Mix everything. Take a spoonful of the ground beef mixture and shape it into a skewer. Grill over charcoal or regular grill until cooked through and serve with peanut sauce.