To begin, roast the jalapeños, onion, tomatillos, and garlic
Mix all the ingredients together after they have been roasted and cooled
Sour cream, mayonnaise, roasted vegetables, cilantro, lime juice, salt, black pepper, cumin, and lime juice are all in this category.
Combine the ingredients and mix until smooth. Cleaning the sides might require a few stops.
Make any necessary adjustments to the spices. You can add some of the jalapeno seeds you set aside earlier if you want more heat. It may be necessary to add more lime juice, salt, or both.
Refrigerate the sauce for at least an hour before serving. Cold sauce tastes best. However, if you must serve it right away, you may do so.