Add cashews to a heat-safe bowl. Meanwhile, boil water using an electric kettle. Then, pour hot water over cashews to cover and set aside to allow cashews to soften for at least 10 minutes.
While cashews are softening, roughly chop cilantro and garlic.
Add cilantro, garlic, and half of an avocado into a high-speed blender. Squeeze in 2 limes, then add water, salt, pepper, olive oil, and agave syrup.
Once cashews have soaked for at least 10 minutes, rinse and drain before adding into the blender.
Blend on medium-high speed until ingredients are well-combined.