Blueberry and Lavender Bundt Cake

Name: Blueberry and Lavender Bundt Cake
Prep time: 25 min
Cook time: 2 h 45 min
Total time: 2 h 45 min
Yield: 12 slices
Ingredients: 270 g caster sugar; 1 ½ tsp edible lavender; 175 g unsalted butter; 100 g buttermilk; 320 g self-raising flour; 3 large eggs; 1 tsp baking powder; 200 g fresh blueberries; &frac18; - ¼ tsp edible lavender; 250 g caster sugar; 6 tsp water; food colouring paste