You could try this...
The Whole Chile Pepper Book has a recipe for Papas a la Huancaina that is a dish of boiled potatoes topped with cheese and a sauce that is probably light green and creamy. Here's the sauce part: - Curtis Jackson
Aji Sauce
2 aji chiles or-3 jalapeno chiles
1 cup queso blanco (white cheese) or munster
1 cup heavy cream
2 tbsp olive oil
Combine 2 aji or 3 jalapeno chiles, stems and seeds removed and chopped, 1 cup queso blanco or Munster cheese, and 1 cup heavy cream in a blender and puree until smooth.
Heat 2 tablespoons of olive oil and slowly add the cheese mixture, stirring constantly. Simmer the sauce for 5 minutes or until it thickens.
If the sauce you remember didn't have cheese in it, try omitting it.
Servings: 4