In a blender jar add the chopped pineapple pieces ,mint leaves, ginger and sugar and blend it well to make a fine smooth puree.
Now strain it with a sieve in a big bowl or container.
Add lemon juice and mix well.
Now add chilled water or club soda and mix.
Rub some lemon juice on the rim of the serving glass.
Spread some sugar and salt in a plate and dip the glass rim into this to decorate the glass.
Now fill the agua fresca in the serving glass garnish with mint and lemon slice and serve !!
TIP- You can make and strain the concentrate and refrigerate it and add water and soda only when you want to serve it.