01 - Preheat oven to 350°F. Grease and flour an 8-inch round cake pan, ensuring even coverage to prevent sticking.
02 - Whisk together flour, baking powder, and salt in a medium bowl until thoroughly blended. Set aside for later use.
03 - Beat softened butter and granulated sugar in a large bowl until light and fluffy, approximately 3-4 minutes. Add eggs one at a time, mixing well after each addition. Stir in chopped lavender and vanilla extract.
04 - Alternate adding the flour mixture and milk to the butter mixture, beginning and ending with the dry ingredients. Mix until just combined, being careful not to overmix.
05 - Pour batter into the prepared pan and smooth the top evenly. Bake for 25-30 minutes until a toothpick inserted in the center comes out clean.
06 - While cake bakes, simmer water, sugar, and lavender in a small saucepan for 3 minutes. Strain through a fine mesh sieve and set aside to cool slightly.
07 - Allow cake to cool in the pan for 10 minutes. If using syrup, poke small holes across the surface with a skewer and gently brush with warm syrup. Cool completely before glazing.
08 - Whisk powdered sugar, lemon juice, and chopped lavender until smooth and drizzle-consistency. Pour over the completely cooled cake, allowing it to drip down the sides naturally.
09 - Let the glaze set for 15-20 minutes at room temperature before slicing and serving.