Using a cheese box grater, grate frozen butter over dry ingredients. (shelovesbiscotti.com)
I've never used a potato ricer, I've always just used the cheese grater attachment on my food processor, but I'm sure others will be appreciative of the tip (jenncuisine.com)
Peel jicama, place a box grater on layered paper toweling; grate jicama. (nielsenmassey.com)