Cut the lemons in 3 or 4 pieces, leave the 2 ends out.
Use CalsunO Lemon Juicer to squeeze the lemon parts to equal 1 cup juice. Reserve juice and 4 squeezed lemon halves
Mix 1 cup of water with sugar in a small saucepan over medium-high heat, stir often until sugar dissolves. Remove from heat, and cool for 10 minutes.
Put 30 ice cubes (you can make it with our CalsunO Ice Tray which makes 15 ice cubes each tray Amazon Page) in a large pitcher, pour the sugar syrup just made in the pitcher. Stir until ice is mostly melted. Add reserved lemon juice and 2 cups water; stir to mix.