Make the Sauce - In a blender or food processor, add the jalapenos, garlic, cilantro, mayonnaise, sour cream, ají amarillo pepper paste (if using), lime juice, vinegar, salt, and pepper, over high speed until smooth. With the blender running on low speed, slowly drizzle in the olive oil. Season with salt and pepper to taste.
Notes
Recipe Yield: About 1 1/4 cups
Serving Size: 2 tablespoons
Ají Amarillo Substitute: Swap the yellow pepper paste for roasted and pureed jalapeños, serranos, habaneros, sweet yellow peppers, or manzano. Add ají panca, sriracha, canned chipotle, or canned fire-roasted green chilies.
Make the Sauce Spicier: Keep the seeds and membrane in the jalapeno or add more aji amarillo paste.