1 Place Blueberries, Sugar, Lemon Zest, Lemon Juice, And Cinnamon Into A Medium Saucepan. Heat Until The Sugar Has Melted And The Mixture Is Just Barely Coming To A Simmer. Use A Potato Masher To Mash Up The Berries A Bit, To Release The Juices. Remove From Heat And Let Come To Room Temp. 2 Preheat The Oven To 425