Gather all your ingredients: fresh cilantro, garlic, Greek yogurt, mayonnaise, lime juice, ground cumin, salt, black pepper, and water. Rinse and pat dry the cilantro, then peel and finely mince the garlic.

In a blender, combine the cilantro, minced garlic, Greek yogurt, mayonnaise, lime juice, ground cumin, salt, and black pepper. Blend on high for 30-60 seconds until smooth and creamy.

Check the sauce's thickness. If you prefer a thinner texture, gradually add water, one tablespoon at a time, blending in between.

Taste your sauce and adjust as necessary by adding more salt, lime juice, or black pepper to suit your taste.

Serve immediately as a dip or condiment. Store any leftovers in an airtight container in the fridge for up to a week.