Step 1

Add the chilli flakes (and salt, if using) to a heatproof medium size bowl.*

Step 2

Heat the vegetable oil in a small saucepan over medium heat until it reaches between 225-250° F (110-120°C). The time it takes to reach this temperature will depend on your stove and the size of your pot, but generally speaking it shouldn't take too long, roughly between 3-6 minutes. If you don't have a thermometer, you can test the oil by placing the tip of a wooden chopstick into the oil, and if there is some slight bubbling (it doesn't need to be a lot) then you're ready to go. If the oil is smoking, bubbling or spitting then it's too hot.

Step 3

Pour the hot oil over the chilli flakes. Be careful as it will bubble up. Allow to cool before sealing in a glass jar. Note: you can strain out the chilli flakes if desired.