Step 1

Add 1 cup of blueberries, water, sugar, and lemon zest to a small pot.

Step 2

Bring the mixture to a boil and then reduce heat to medium-low. Simmer for 10 minutes, stirring occasionally.

Step 3

Add the remaining cup of blueberries to the pot and continue to simmer for another 8 minutes.

Step 4

Remove pot from the heat and stir in lemon juice.

Step 5

Cool and place in a glass jar. Refrigerate overnight to thicken.