Peel, pit and cube the peaches and place into a blender with the sugar. Add the concentrated lemonade to the blender. Fill the can that the lemonade came in with vodka and pour that into the blender as well. Pulse to combine these ingredients. Pour half of the mixture into a bowl and refrigerate for later. To the remaining mixture in the blender, add enough cubed ice to fill the blender. Blend until the ice is slushed and the mixture is completely combined. Can rim glasses with sugar if desired. Pour slush into glasses and serve. This recipe makes two batches and is also great with strawberries.
Note: The vodka can be eliminated for a fun kids summer drink.