Coriander Sauce

Ingredients

• bunch fresh cilantro

  stemmed (about 1 cup loosely packed leaves)
  1 unit
• garlic

  peeled
  3 cloves
• jalapeno

  or other hot pepper, seeded
  1 unit
• walnut pieces
  ½ cup
• fresh lemon juice or ⅓ cup distilled white vinegar
  ⅓ cup
• salt

  or to taste
  1 tsp
• freshly grated black pepper
  ½ tsp
• ground cumin

  (optional)
  ¼ tsp
• water

  up to 4, or as needed
  2 tbsp