Rinse cashews thoroughly in water. Drain all the water and discard it.
Place the cashews in a bowl and cover with enough warm water. Soak them for 30 minutes.
Drain and discard all the water from the soaked cashews and add nuts to a blender. Also add dijon mustard, raw sugar, turmeric powder, black peppercorns and rock salt.
Add apple cider vinegar or lemon juice.
Add the sunflower oil or any neutral tasting oil.
While the blender is running, slowly add 7 to 8 tablespoons water in parts and blend until smooth and creamy.
Pour your completed vegan mayonnaise into a clean jar or airtight container. Seal it tightly and refrigerate. This eggless mayo stays good for a month in the refrigerator. You can also freeze it for 3 months.