Make the ice cream base according to the Classic Ice Cream Method. Add the crème fraîche once the custard is made and it is still hot. Whisk thoroughly to completely dissolve the crème fraîche.
Strain the base through a fine-mesh strainer and cool over an ice bath. Age the base under refrigeration overnight.
Once the base has aged, churn to the desired consistency.
Harden for at least 2 hours and up to 4 hours. Reserve until needed.