Using a large saucepan or stockpot, add water, sugar and ginger; stir and place over medium-high heat. Heat until mixture reaches a boil, stirring occasionally. Once boiling, remove from heat and stir in lemon juice.

Let mixture rest for 30 minutes and then strain out sliced ginger.

Refrigerate lemonade for 1-2 hours, or until cold.

Serve over ice and (optional) garnish with sliced lemons and sprigs of fresh mint.