A boozy, buttery upside-down cake with a caramelized berry topping and a tender vanilla cake base. Warm berries release their juices into a rum-laced glaze, creating a sticky, vibrant crown that inverts onto a golden crumb.
Store leftovers covered at room temperature for up to 2 days. To freeze, wrap the cooled cake tightly in plastic wrap and then foil; freeze for up to 1 month. Thaw at room temperature, then reheat individual slices in a 300°F (150°C) oven for 5–8 minutes. For a non-alcoholic version, substitute the dark rum with 2 tablespoons of fresh orange juice plus 1/2 teaspoon vanilla extract. The rum adds depth and balances the sweetness; do not skip it unless necessary.
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