Bring sugar and water to a boil, then remove from heat and let cool to room temperature.
Place strawberries into a food processor or blender and process/blend until smooth.
Pour pureed strawberries into the sugar water.
Add lemon juice and stir well.
Use strainer to remove seeds and pour mixture into a large pitcher.
Heat 2 cups lemonade and 1 1/2 cups of sugar in a sauce pan, stirring until sugar is melted.
Pour into a lidded jar and refrigerate.