The night before, or early in the morning, soak the cashews. If you don't have time or forgot to soak them, you can place them in boiled water for 3-4 hours or even boil them for an hour.
Place the cashews in a food processor and add the lemon juice, the salt, the pepper, and the water and blend until completely smooth.
Blend for a few minutes, depending on the strength of your food processor.