This Blueberry Pudding Cake is a comforting, old-fashioned dessert that combines a tender cake with a luscious blueberry sauce. Fresh or frozen blueberries are tossed with cinnamon, lemon zest, and juice to create a fragrant, tangy base. A simple almond-scented batter is poured over the berries, then finished with a sprinkling of sugar and cornstarch and a cup of boiling water, which forms a rich, syrupy layer as it bakes. The result is a warm, cozy cake with a lightly golden top and a sweet, jammy blueberry pudding beneath—perfect served on its own or with a scoop of ice cream.