• Mix all sauce ingredients, except for arrowroot and water, in a small bowl and set aside.
• Heat a large pan on the stove, add oil, and then ground beef. Break the beef into small chunks.
• When the beef is mostly cooked, but not all the way, add salt, to taste.
• Next, dump the onion and pineapple into the pan and cook until soft.
• While the pineapple and onions are cooking in the meat, heat the sauce in a small saucepan over medium/high heat.
• Let the sauce come to a light boil, then simmer for about 2 minutes, then turn the heat to low.
• Mix the arrowroot starch and water in a small bowl and then pour into the sauce.
• Stir for a minute or two, or until the sauce thickens.
• Serve the meat in individual lettuce leaves and top with the sauce, shredded carrots, cilantro, and extra lime.

Source: studio5.ksl.com