Place the blueberries in a medium pan with 1 tablespoon of water, 1 tablespoon of the honey and the petals from the lavender heads. Set the pan over a medium heat and bring the mixture up to the simmer. Cook the blueberries for 3–4 minutes, or until they are just beginning to soften and collapse. Remove the fruit compote from the heat and allow it to cool, then transfer to the fridge to chill.