Make the blueberry chia compote. Add the frozen blueberries to a small pan with 2 tbsp of water and set over a medium heat. Simmer for 4-5 minutes until the blueberries have broken down, then turn off the heat and stir in the chia seeds. Squeeze in a little lemon juice to taste, keeping it nice and zingy. Transfer to a container and keep in the fridge.