Start by washing your jalapenos, cilantro, and green onion under cold water.

In a blender or food processor, combine the sour cream, mayonnaise, jalapenos, garlic, cilantro, lime juice, salt, pepper, and cumin.

Blend until the mixture is smooth and creamy. You may need to stop occasionally to scrape down the sides with a rubber spatula.

Add the chopped green onion and pulse a few times to mix them into the sauce without pureeing them fully, allowing for small flecks of color and texture.

Taste and adjust the seasoning if necessary. For a thinner consistency, a tablespoon of water or additional lime juice can be blended in.

Transfer the sauce to an airtight container and refrigerate for at least an hour to allow the flavors to meld together beautifully.