Make the raspberry syrup by combining the raspberries and sugar in a saucepan.

Over medium heat, stir until sugar dissolves.

Turn up heat to medium high and let the mixture boil to thicken.

Push the raspberry syrup through a fine sieve to remove the pulp. Save the pulp for another use such as these Raspberry Bars.

Mix in the lemon juice.

Add still or sparkling water to the sweet / tart desired.

Serve over ice and garnish with mint or frozen raspberries, if desired.