Place the aquafab, vinegar, syrup, mustard and salt in a jug.

Using a stick blender, whizz the ingredients until fully combined.

Add 2 tbsp oil and pulse the blender the oil is just combined (this only takes a few seconds)

Add another 2 tbsp oil and pulse for a few seconds again.

Repeat this process adding just 2 tbsp oil at a time, until all the oil is incorporated and the mayonnaise has become thick and creamy. (It is important to add the oil slowly, so it has a chance to emulsify).

Taste test and add a touch more vinegar, mustard, sweetener or salt, if desired