i love them, but have never made one at home. I've read sugar cubes or powdered sugar, muddle the sugar and mint or make a mint syrup. So, Pack, what's the best way.
You can try the sugar or powdered sugar approach but it never really gives you what you want. I just make my own simple syrup-1 cup of sugar boiled out in 1 cup water. Muddle it with some mint but also pour it to the level you want.