Steep: Combine lavender buds and sugar in a large bowl. Pour 2 cups boiling water over mixture, stir, and let sit for 30 minutes.
Assemble: Strain lavender buds from sugar water then combine with 1 cup of cold water and lemon juice. Taste test, adding more sugar or water as needed. Chill as needed, then serve with ice.
Freeze (Optional): To make a slushy, pour lemonade into a large baking dish and set in the freezer. Stir and scrape the mixture with a fork every hour, until a slushy has formed.
Notes
For a lower sugar option,you could try replacing half of the sugar for your favorite sugar-alternative.Make it a cocktail by adding 1 oz of vodka or run for every 8 oz of lemonade.