Start by juicing the lemons. Cut them in half and squeeze out the juice into a small bowl. Set aside.

In a cocktail shaker or a tall glass, muddle the mint leaves and sugar together. This will release the mint's flavour and combine it with the sweetness of the sugar.

Add the freshly squeezed lemon juice to the cocktail shaker or glass. Stir well to dissolve the sugar and mix the flavours. Fill a serving glass with ice cubes.

Pour the mint and lemon mixture over the ice. Top the glass with sparkling water or soda filling it to the brim. Stir gently to combine all the ingredients. Garnish the mocktail with a slice of lemon and a sprig of mint.

Serve immediately and enjoy your refreshing Lemon Mojito Mocktail!. Adjust the amount of sugar according to your taste preference.