Drain and rinse the cashews. Blend them with the mango, banana, orange juice, coconut water, turmeric, ginger if using, honey and vanilla in a blender on high speed until completely smooth and creamy. (Add more coconut water if you prefer a thinner consistency.)
You can often get fresh turmeric at Whole Foods, health food stores and Indian markets. You can substitute 1/4 teaspoon dried turmeric, but be sure the spice is reasonably fresh (meaning it hasn't been in your spice drawer for years-old dried turmeric tastes dusty and bitter). Coconut water has a natural sweet flavor; if you use plain water, you may need more honey (start with a tablespoon and add more to taste).
This recipe was provided by a chef, restaurant or culinary professional. It has not been tested for home use.