Put the almonds in the food processor.
Press on and leave it to blend for about 15 minutes (with a powerful food processor, a bit longer with a weaker one). Scrape down the sides occasionally. It looks like it is never going to work, it makes a powder for a long time and you think that is all that is going to happen. And then suddenly, as if by magic, it becomes a smooth paste and then a creamy butter.
Depending on your desired consistency, add a little coconut oil or sunflower oil to make it a bit more runny and creamy. This is optional, you may be happy without the oil.
If you want a crunchy almond butter, add a few almonds at the end and allow it to blend for another few minutes.
Add a tiny bit of salt (optional).
Scrape back into the two jars and store in the fridge. Lasts for weeks in the fridge (if you don't gobble it all up at once, that is!).