Measure out the oils and add to a small bowl or pouring jug.
The one thing I remember from watching my mum make mayonnaise is that you cannot add the oil quickly. At the start you need to add the oil in very small amounts, then whisk away until well blended, then add some more. If you don't it goes all lumpy and it is really hard to create a smooth consistency from there. You then keep going until the oil is completely added. You can start to add a little more once you have added quite a lot of oil.
Add white vinegar and season with salt and pepper, then whisk a little more.
Transfer to an air tight container and refrigerate.
Notes:
If you like a less "coconut" flavour you can use macadamia oil. I have made this recipe with no coconut oil and all macadamia oil and with ¼ cup macadamia oil and ¼ cup coconut oil and they both turned out well.
Recipe by Planning With Kids at https://planningwithkids.com/2013/03/31/coconut-oil-mayonnaise/