Make your lemonade, however you like it. Everyone has their own recipe for lemonade.
In an ice cube tray, place one raspberry and one mint leaf in each compartment (if the mint leaves are small, I usually put two).
Fill ice cube tray with lemonade and freeze.
Once frozen, add to your lemonade. Once the cubes start to melt, it will infuse the lemonade with the flavor of the raspberries and mint leaves, and since it was frozen with lemonade and not just plain water, it will not "water down" the flavors.