Cashew Mayonnaise

Ingredients

1. ¾ cup/100g cashews, soaked and then drained (soak overnight for creamiest mayonnaise; otherwise at least 2 hours)
2. ¼ cup/60ml avocado oil or flax oil (I prefer avocado oil for the taste)
3. ¼ cup/60ml water
4. 1 tablespoon lemon juice
5. 2 teaspoons cider vinegar
6. ½ teaspoon salt
7. ½ teaspoon mustard powder
8. ½ fresh garlic clove, chopped, or ¼ teaspoon (a pinch) garlic powder
9. Celery tops or fresh parsley for garnish (optional)