Homemade Gerbil Food?

I'm trying to find the correct mixture to make my own, homemade gerbil food.  I used to do this with my rats since I had so many of them, plus it was cheaper and healthier for the rats than store bought mixed foods.  If anyone has gerbil experience and has ever made their own gerbil mix, I'd love to know what base ingrediants you used. I've done a lot of online searching, but can't find anything consistent enough to be sure I'm concocting a good recipe.

Thanks!