In a medium bowl, add cashews and cover with 2 cups boiling water. Let soak for 30 minutes. Drain well and discard soaking liquid.: The bowl will steam as the hot water envelops the cashews , and after about 30 minutes they should feel plump and slightly springy between your fingers, which signals they are ready. Draining removes the starchy, slightly bitter soaking liquid, which can cloud the flavor. If you skip draining, the final cream may taste thin or slightly off; always discard the soak liquid. One troubleshooting tip is to taste a softened nut to ensure it is no longer chalky, otherwise extend the soak slightly.
In a high-speed blender, add drained cashews and 1/2 cup water. Blend until smooth, adding more water as needed to get a creamy consistency.: When you start blending, listen for the motor’s shift from a high pitched whir to a deeper, smoother hum, which often indicates the mixture has emulsified. The surface should look glossy and the flow should be uninterrupted when you stop the blender and scrape the sides. If it sounds grainy or you see specks, pause and scrape down the cashews , then blend again. Avoid adding too much water at once, as an overly thin start can prevent a velvety texture; add small amounts gradually for control.
For a savory sauce, I add an additional 1/2 cup water for 1 1/2 cups total. Season to taste with salt (I like 1/4 teaspoon).: Savory variations should have a slightly thicker coating texture, so adding an extra 1/2 cup of water brings the body to sauce friendly thickness. Smell for a clean, nutty aroma without any raw edge, which signals balance. When seasoning, stir and taste between increments, because salt intensity changes as the cream integrates. A common error is over diluting, which leads to a thin sauce; if that happens, blend in a few more cashews or reduce liquid on the stove to concentrate.
For a coffee creamer, I add an additional 1 cup water for 2 cups total. Add vanilla extract to taste (I like 1 teaspoon).: For beverages you want a lighter, pourable consistency that still rounds the mouth, so increasing to about 2 cups total water achieves that. The aroma should be slightly sweet and inviting once the vanilla is incorporated, and the texture should cascade off a spoon in a steady ribbon. If the creamer separates when cooled, re-blend briefly to re-emulsify. A typical pitfall is adding too strong a flavoring right away; instead, add small amounts of vanilla and taste, because it can quickly dominate the delicate nut base.