I love this version of Swedish Meatballs. I have no idea how "authentic" it is, but I enjoy it. Instead of using half-and-half I usually use all milk but the half-and-half will make a creamier sauce. You can substitute ground turkey or chicken for half the ground beef, but I wouldn't substitute it for more than half the ground beef because you want the drippings for making the gravy. I normally serve this over mashed potatoes.