The ratio of eggs to flour in this recipe is slightly different - you can use that, or the one I’m highlighting here.
You can, of course, substitute other liquids, or use yellow (or orange) beets. If you have success with these noodles, use the recipe as a jumping off point for other flavors. The ratio of eggs to flour in this recipe is slightly different - you can use that, or the one I’m highlighting here. The ideas is the same, swap in strong juice for water in the recipe.