Prepare the lemon shells: First, grate the peel from one of the lemons and set aside. Cut off the tops of the 3 lemons. Carefully use a small spoon to scoop them out without breaking the peels.

2. In a pan, add the sugar, lemon zest, water and mint. Heat gently until boiling and the sugar has dissolved. 3. Chop the lemons in half and squeeze over a sieve into a jug. Pour the sugar syrup ...