The recipe calls for half ground beef and half ground pork. I subbed in ground turkey for the beef. I thought it was a great lower fat substitution. To be honest, I thought the beef had a little more flavor than the turkey, but the turkey was worth it for the health benefits, and at the grocery store I shop at, ground turkey is cheaper than beef...so, double bonus!
Above is Lillian my 5 year old (Ok, she is 4, but her Birthday is in 5 days, so I rounded up!) She really does love to help in the kitchen. She scooped and I rolled into balls.