* For the freshest-tasting whipped cream, use heavy cream that doesn’t contain any other ingredients besides cream. Some brands contain stabilizers such as carrageenan or other gums or thickeners. Although they aren’t ideal, your cream will still whip up just fine; I just prefer the clean, fresh taste of cream without these unnecessary ingredients.
** Crème fraîche—basically the “fancy” French version of sour cream—has more fat and less tang than sour cream, but it’s not as widely available and is usually more expensive. I’ve had success using either in this recipe, so feel free to use whichever you prefer.