In a blender or more preferably)a long beaker with a hand held immersion blender start whizzing up the garlic and aquafaba (Chickpea juice) .
Let it whizz around until becomes foamy.
With the motor on, add in a thin stream the sunflower oil, carefully blending and adding more oil.
It should start looking like very thin cream, keep adding oil, it will start to thicken up.
Add the lemon juice, sriracha and salt to taste.
Whizz again and add more lemon juice or salt as needed.
It's not an exact science, and you'll know when you reach the right 'flavour' and consistency.
Keep adjusting, maybe adding bit more oil & whipping more to thicken the mayo up.
Serve on everything, or store in an airtight container in the fridge.
Notes
Keep the mayo in a jar in the fridge. It keeps for at least a month.Eat on everything. Fries, sandwiches, burgers.. add to coleslaw. I wouldn't add it to smoothies though. That would be weird.