Raspberry Mint Lemonade

3 cups water
1/2 cup fresh mint leaves, finely chopped
3/4 cup sugar
24 oz frozen raspberries
1 can (12 oz) frozen lemonade concentrate, thawed
1 cup cold water

In a large saucepan, bring the 3 cups water, mint leaves, and sugar to a boil, stirring until the sugar is dissolved. 
Remove from heat and let stand for 5 minutes. Add in the raspberries and the lemonade concentrate and stir together.
Use a spoon to mash the raspberries.
Pour the mixture through a fine strainer into a large bowl with a lip. Discard the pulp.
Add 1 cup cold water to the mixture and pour into a pitcher (use a funnel if needed).
Refrigerate before serving.