Begin by gathering all your ingredients: fresh cilantro, lime juice, jalapeño, garlic, and mayonnaise. Rinse the cilantro under cool water, and pat it dry. If you prefer a milder sauce, carefully slice the jalapeño and remove the seeds and ribs. Next, peel the garlic cloves, ensuring they are clean and ready to blend.

In a high-speed blender or food processor, add the cilantro, lime juice, jalapeño, garlic, and mayonnaise. Make sure to include both the leaves and stems of the cilantro for maximum flavor. Secure the lid tightly on the blender to prevent any splatters as you prepare to blend the ingredients together.

Blend the mixture on high speed for about 30 seconds or until it reaches a smooth and creamy consistency. If you're using a standard blender, you may need to stop and scrape down the sides with a spatula every now and then to ensure an even blend.

Taste your Creamy Cilantro Garlic Sauce and adjust the flavor as needed. If it's too thick, add a little more lime juice until you reach your desired consistency. For an extra kick, feel free to add more jalapeño or a pinch of salt to enhance the flavors. Blend again briefly to incorporate any adjustments.

Pour the sauce into a sealable squeeze bottle or an airtight container for easy storage. If you're enjoying it immediately, drizzle it over grilled meats, tacos, or salads.