Add all the ingredients in a medium-size metal bowl and stir.
Pour the liquid into a large freezer bag, and place it in the freezer until frozen for approximately 4 hours.
When ready to drink, massage the freezer bag by hand until it’s a wet, slushy consistency. If it’s not breaking up, run the bag quickly under hot water, and massage some more.
Divide among four Old Fashioned or rocks glasses.
Garnish each glass with mint leaf and lemon wheel.
*Mint simple syrup: Place 1 ½ cups boiling water and 1 ½ cups pure cane sugar in a saucepan over medium heat and bring to a boil. Reduce the heat to a simmer and stir the mixture, letting the sweetener dissolve, for about 3 minutes. Add 5 tbsp dried mint, and continue to heat, over medium heat, for an additional 12 minutes. Strain out the mint leaves with a fine-mesh strainer, then let the syrup cool. Place it in a sealed container, and store in the refrigerator for up to 1 week. Makes 2 ¼ cups.