Mexican Crema

Directions

1. 1
   In a small glass bowl, combine both ingredients.
2. 2
   Cover the bowl loosely, and let it stand at room temperature for 8 to 24 hours, until the cream is thickened and tart.
3. 3
   Stir it well, cover it tightly and refrigerate it.
4. 4
   Use it as needed.
5. 5
   Crema keeps for up to 10 days.