Beets of Burden Burger

I was excited for the "borscht on a bun" concept of this burger. And ultimately, the beet slaw was pretty good (if underseasoned) and it was a pleasant burger topping.

But the poor rating is because the recipe isn't specific enough. How large is a large beet? How big is this head of cabbage that I'm supposed to use 1/4th of? 1 or 2 large carrots... well, which is it? I ended up with enough to top 10 burgers easily, but the recipe claims to make 4. This is going to take more experimenting to find the right proportions of ingredients. I suppose the lesson is that slaw is not a science and you should use the amount you want, and be glad for leftovers.