01 - Squeeze fresh juice from all 4 lemons, removing any seeds.
02 - In a large pitcher, combine lemon juice with sugar. Stir thoroughly until sugar completely dissolves.
03 - Pour cold water into the pitcher. Mix well to incorporate all ingredients.
04 - Add ice cubes to chill. Taste and adjust sweetness by adding more sugar or water if needed.
05 - Pour into glasses over ice. Garnish with lemon rounds and fresh mint leaves if desired.