That prompts another question altogether: Should you use salted or unsalted butter? Some recipe developers call for salted butter, as a salty, crispy piece of bread can add more dimension to the ...

To make the spiced butter, mix all of the ingredients together in a bowl. Wrap in cling film and chill until needed. To make the parmentier potatoes, place in a saucepan and cover with water.

sticks of unsalted butter on a faux-wood countertop - Smartstock/Getty Images ...