.. (Colcannon)" from fiveandspice. If not one day in advance, how far in advance same day can it be made? I'm assuming that I could infuse the mil...

I often cook colcannon on a Sunday and use it throughout the week. My best results have been by always ricing the potatoes and using buttermilk. Warm milk or half and half can be poured over the colcannon servings at the table and stirred in.

There have been a number of past discussions on making mashed potatoes ahead of time that you might find helpful, here are a couple: http://food52.com/hotline/9640-how-far-ahead-can-you-make-mashed-potatoes and http://food52.com/hotline/16944-prep-ahead-mashed-potatoes. And you can always send a direct message to the author of the recipe to get input by clicking the envelope button on their profile page (http://food52.com/users/10300-fiveandspice).