This is one of our favorite burger recipes and it really tastes great with turkey. But, I get it. Some people aren't into substituting turkey for ground beef because it doesn't taste beefy. For some recipes, I won't make the substitution either. But, when I do, my favorite thing to add is a tablespoon of Worcestershire sauce per pound of ground turkey. It adds some much flavor and does help the turkey resemble more of a beefy taste.