Add the blueberries, sugar and 3/4 cup water to a stainless steel saucepan.
Heat over medium heat, crushing the berries, and simmer for 10 minutes.
Pour through a fine mesh sieve into a large pitcher and press lightly.
Let the syrup cool for 10 minutes.
Finish the Lemonade
Stir in the fresh lemon juice and watch the color turn violet.
Pour in the cold water and stir well.
Add more water or a little sugar until the flavor tastes balanced.
Refrigerate for at least 1 hour.
Stir, pour over ice and garnish with lemon wheels and blueberries.
Notes
Use stainless steel, not aluminum. Add lemon juice to keep the color bright. Sparkling water works for the last 3 cups. Stir before pouring. Keeps 4 days in the fridge.