01 - Combine water and sugar in a small saucepan. Bring to a simmer over medium heat, stirring constantly until sugar completely dissolves. Remove from heat immediately.
02 - Stir dried lavender into the hot syrup. Cover and let steep for 15 minutes to extract floral flavor.
03 - Pour syrup through a fine-mesh sieve into a clean container. Discard lavender solids. Allow syrup to cool to room temperature.
04 - In a large pitcher, combine lemon juice, cooled lavender syrup, and cold water. Stir thoroughly until fully blended.
05 - Taste and adjust sweetness or tartness by adding more water, syrup, or lemon juice as needed. Add ice cubes to pitcher. Serve over ice, garnished with lemon slices and lavender sprigs if desired.