Rinse the frozen blueberries lightly under running water for about 10 seconds and drain them using a sieve.

Mix the blueberries with sugar in a mixing bowl and let it sit for 10-20 minutes until the sugar dissolves.

Cook the mixture over medium-low heat, stirring gently until it thickens and becomes creamy.

Turn off the heat, add lemon juice, and mix well. Transfer the compote to sterilized airtight containers and refrigerate.