01 -
Rinse and dry the cilantro well. Zest the lime, then cut it and squeeze the juice.
02 -
Add sour cream, mayonnaise, cilantro, lime zest, lime juice, garlic, salt, and jalapeno if using to a blender or small food processor. Blend just until smooth and pale green.
03 -
Add cold water 1 teaspoon at a time until the crema is thick but drizzleable. Taste and add more salt or lime juice if needed.
04 -
Serve right away over tacos, bowls, nachos, chicken, fish, or vegetables. For a rounder flavor, chill for 10-15 minutes before serving.