In a large pitcher, combine the lemon juice, water, and sugar. Stir until the sugar is completely dissolved.
Add the pineapple juice to the pitcher and stir well.
If you want to get a little creative, add a few drops of blue food colouring to give it that fun Minion colour. Stir until the colour is evenly distributed.
Just before serving, add the soda water for a fizzy touch.
Fill glasses with ice cubes and pour the Minionade over the ice.
Garnish with lemon slices and add Minion-themed straws or stirrers for extra flair.