01 - Combine milk and dried lavender in a small saucepan. Heat gently over low heat until just steaming, not boiling (about 2 minutes). Remove from heat and steep for 5 minutes.
02 - Strain the milk through a fine-mesh strainer to remove lavender buds. Allow the infused milk to cool slightly before proceeding.
03 - In a mixing bowl, whisk powdered sugar with 2.5 to 3 tablespoons of the lavender-infused milk. Add lemon juice if using. Whisk vigorously until completely smooth and pourable.
04 - Check glaze texture. Add more milk to thin if too thick, or additional powdered sugar to thicken if too runny. Aim for a ribbon-like consistency that drizzles easily.
05 - Drizzle or spread glaze evenly over cooled baked goods. Allow to set at room temperature for at least 10 minutes before serving.