01 -
Put the heavy cream into a spotless glass or ceramic container.
02 -
Mix in the buttermilk or yogurt with the cream.
03 -
Gently stir to blend everything together.
04 -
Place a loose-fitting lid over the container.
05 -
Set it aside at room temperature for roughly 12 hours to rest.
06 -
The texture should now feel like crème fraîche.
07 -
Move the container into the fridge once it's thickened enough.