Here we go!
We used a total of 10 small red potatoes, with five in each baking dish. We also use kosher salt because of the texture. I've read other recipes that use a mixture of rock salt and kosher salt and we'll give that a try. I don't think that normal salt would work as well since the salt would bake to solid rock-like consistency. If you try it with table salt, let me know how it goes.