The menu says it's a spicy ranch sauce so maybe add some white prepared horseradish to ranch dressing? I'll look and see if there is a real recipe from Disney posted somewhere.
Not sure if it's been discussed, does anyone happen to know the recipe for the Horseradish Dipping Sauce they serve at Sci-Fi Dine-In with the fried pickles? It's so good!
Either buy or make your own ranch dressing (I use the Hidden Valley Ranch envelope, myownself)
Add Frank's (brand) hot sauce to taste.
Swear, it's so easy to make and so yummy! You could probably use any brand of hot sauce, but that's what works for me...
Oops, ETA, I missed that you wanted "horseradish" ranch, thought it said spicy ranch, my bad!