Preheat your oven to 200 degrees Celsius. Remove the ends of the lemons and discard them, then cut the lemons in half crossways, giving you a 4 x 2.5cm/1 inch thick discs.
Now, using a small knife, remove the lemon flesh leaving you with 4 hollow circles of skin.
Lay a greaseproof paper square or lemon leaf on a chopping board and place one of your lemon skin ‘wheels’ on top. Cut a piece of mozzarella to fit inside, then lay a basil leaf, half an anchovy fillet and half a cherry tomato on top with a small pinch of salt and pepper. Add a little dried chilli if you like. Put another slice of mozzarella on top – the lemon skin should now be filled up.
Do the same to the rest of the wheels, place them on a baking tray, and cook in the preheated oven for 10 to 15 minutes until golden and bubbling.
Remove from the oven and allow to cool for a few minutes, then serve with some hot grilled crostini. Simply scoop the mozzarella out, eat with the toast and mop up any juices.