1 cup walnut pieces
2 cups cilantro leaves, washed, drained and stemmed
1 green jalapeño pepper, seeded and chopped
1 tsp salt, or to taste
2 tbsp cider vinegar
Put the walnuts in a food processor and grind until fine.
Add the cilantro, jalapeño pepper, salt, vinegar and 2 to 3 tbsp of water and blend. Blend in a little more water if necessary to make a thick sauce. Taste and correct the seasoning, adding more salt if necessary.