Place all ingredients into a food processor and pulse blend until smooth.
Add salt and pepper to taste.
Serve immediately, or for best flavor, refrigerate for four to six hours prior to serving to allow the flavors to meld.
You can substitute aji amarillo paste for fresh aji amarillo. Use one aji amarillo chili. Remove the seeds and chop. Sweat the chili in an oiled pan over medium heat until the chili is softened. Then pulse blend with the other ingredients.