Turn into a cocktail by adding 4 to 6 Tbsp. vodka or rum to pitcher. *Click here for the Vanilla Bean-Grenadine Simple Syrup recipe.
Place syrup and mint leaves in a small pitcher and muddle together using a wooden spoon. Add raspberries and lemonade, cover and place mixture in refrigerator to chill. When ready to serve, add soda or seltzer to the pitcher and stir.
Serve over ice, making sure to get pieces of raspberries and mint in each glass.