Combine the sugar and warm water in a pitchers. Stir to fully dissolve the sugar.
Stir in the lime juice.
Add the remaining 3 cups of cold water; stir. Place in the refrigerator to fully chill before serving.
Serve in tall glasses full of ice. Garnish with mint sprig and lime slice (optional).
Notes
How much sugar to use?Using 1/2 cup is lightly sweet and delicious. Once the limeade is chilled the sweetness is not as strong. If you want a very sweet limeade use 3/4 cup or even 1 cup of sugar.VariationsWant a stronger lime flavor? Add more lime juice to the finished limeade after tasting it or add some lime zest. Use simple syrup. Making a flavored limeade is easy too if you use flavored simple syrup (think lavender limeade, cherry limeade....) for extra flavor .Make it sparkling. Instead of regular still water, after the sugar dissolves in the warm water add the lime juice and chill. When ready to serve substitute sparkling water or club soda to finish the limeade.Using alternative sweeteners. Though we've only made this limeade recipe as written here, honey or sugar substitutes can be used.