Begin by gathering the ingredients. Rinse cilantro, cut lime in half and squeeze juice. Slice jalapeño and remove seeds, peel garlic cloves.

In a high-speed blender, combine cilantro, lime juice, jalapeño, garlic, and mayonnaise. Blend on high for about 30 seconds until smooth.

Check the consistency; if too thick, add lime juice or olive oil and blend again.

Pour the sauce into a clean container and store in the refrigerator for up to a week.

Drizzle over tacos, use as a veggie dip or on grilled meats.