250mloila flavourless oil like sunflower or rapeseed oil works well, or a combination of olive oil and flavourless oil.
Instructions
Put the soya milk, vinegar, mustard and salt into a jug and use a hand blender / stick blender to blitz until smooth.
Add the oil (all in one go), and pulse with the hand blender until the mayonnaise starts to thicken.
Mix well and pulse again until the mayo has completely thickened. Store in a jar or airtight container in the fridge for a week.
Video
Notes
Start with all the ingredients at room temperature for best results. The oil and milk emulsify much more easily when everything is at the same temperature.To 'pulse' with your hand blender, just press the power button for a short burst then release, and repeat. This gives you much more control rather than just holding down the button.When thickened, taste and add more salt and/or vinegar to your own preference.