The Zest of lemon can be used to add flavour to an oil.
Step 1: Wash and zest the lemons.
Step 2: Pour the oil into a saucepan.
Step 3: Add the zest of the lemon to the oil.
Step 4: Put the cooker on a very low heat and allow the oil and lemon zest mixture to gently cook.
Step 5: When the oil is cool, sieve the oil to separate the zest from the oil.
Step 6: Pour the flavoured oil into a bottle.