Ingredients
- 2 tsp. butter
- 1 tbsp. plus 2 cups flour
- 2 tsp. baking powder
- 1 1/2 tsp. fine salt
- 6 eggs, at room temperature, separated
- 1 1/4 cups sugar
- 1/2 cup whole milk
- 1 1/2 tbsp. dark rum
- 1 tbsp. vanilla extract
- 1 14-oz. can sweetened condensed milk
- 1 12-oz. can evaporated milk
- 1 cup heavy cream
- 1 16-oz. jar dulce de leche (milk caramel)
Directions
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Heat the oven to 350°. Grease a 9" × 13" baking pan with the butter and dust with 1 tbsp. of the flour. Invert the dish, tap out the excess flour, and set aside.
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Sift the remaining flour, baking powder, and salt into a bowl and set aside. Put the egg whites into a large bowl and beat with a hand-held electric mixer on medium speed until soft peaks form, about 2 minutes. While the mixer is still running, add the sugar in a gradual stream and continue beating again to soft peaks. Add the egg yolks one at a time, beating well after each addition. Alternately add the reserved flour mixture and the whole milk in 3 parts, beating until smooth after each addition. Add the rum and vanilla and beat again briefly until smooth.
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Pour batter into reserved baking pan and bake until golden brown, about 30 minutes. Set the cake aside and let cool slightly for 30 minutes.
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Whisk together the sweetened condensed milk, evaporated milk, and heavy cream in a bowl. Using a knife, poke the cake with holes all over, penetrating to the bottom of the pan. Pour the milk mixture over the warm cake and set aside to let cool completely.
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Cover the cake with plastic wrap and refrigerate until well chilled and liquid is absorbed, at least 4 hours. Spread the dulce de leche across the top of the cake and serve.