You can basically guarantee every last one of these truffled smashed purple potatoes will disappear by the end of your dinner. This super simple dish has four ingredients: potatoes, truffle butter, sage leaves and crunchy Maldon sea salt. There doesn't have to be a special occasion to break out this recipe — make them on a weeknight with easy roast chicken or steak — but they're impressive on a holiday table as well. 

You can't cook with truffle butter; the flavor will all but disappear — it's a finishing ingredient. The butter melts into the smashed potato's crevices, preserving the truffle essence, and the crunchy sea salt provides just enough texture. And yes, truffle butter is expensive. But potatoes aren't, so use a heavy hand with the good stuff.