Wasabi ketchup is a little ridiculous because it's excellent on literally everything. If you don't need another fry sauce in your life you should skip this, otherwise go ahead and double-batch it because it lasts forever and you'll think of 1000 things it can pair with. :) We have this prepared and ready to go at the shop in our sauce section (4 ounce tubs for a buck) if you want to make things really easy.
*1/2 cup mayonnaise
*1/4 cup ketchup
*1 and 1/2 T wasabi paste
Stir to combine and you're done!