2½ cups cake flour, spooned into measuring cup and leveled-off
1 cup packed light brown sugar
1 cup granulated sugar
2 teaspoons baking powder
¾ teaspoon salt
2 sticks (1 cup) unsalted butter, softened
For the Glaze:
1 stick (½ cup) unsalted butter
¼ cup water
1 cup granulated sugar
¼ cup plus 2 tablespoons dark rum
Generous pinch of salt
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Preparation
Chef’s notes
Make-Ahead/Freezer-Friendly Instructions:
The cake can be made up to 1 day ahead of time and stored in a cake dome or covered container at room temperature. It can also be frozen for up to 3 months. After it is completely cooled, double-wrap it securely with aluminum foil or plastic freezer wrap, or place it in a heavy-duty freezer bag. Thaw overnight on the countertop before serving.
Note:
It's important to use cake flour in this recipe. All-purpose flour will make the cake dry and dense.