Hey there @Troble. Did you ever nail an updated Peruvian crack recipe? I have four giant Huacatay mint plants and am looking to cook your pollo alla brasa recipe this coming weekend. I found this description of a sauce from the company that sold me the seeds. Does it approximate to what you have found too?
To make authentic Magical Peruvian Green Sauce or "Ají de Huacatay":
You need: 1 rocoto pepper , 1 hot yellow Aji pepper - both with the seeds removed!, 1 cup of huacatay leaves, a small sprig of mint leaves, Lime juice, lots of garlic, olive oil, salt.
Put everything except the oil in a blender. Blend the peppers garlic and leaves together, adding oil until you get a smooth puree, kind of like making mayonnaise. Add salt to taste.