1 teaspoon vanilla extract

Make the cake:

1. Place 4 tablespoons unsalted butter in the bowl of a stand mixer (or large bowl if using an electric hand mixer). Let sit at room temperature until softened. Arrange a rack in the middle of the oven and heat the oven to 350 F. Coat an 8-by-8-inch square pan with butter, then coat with flour and tap out the excess.

2. Add 1 cup granulated sugar and 1 large egg to the butter. Beat on medium speed until light and fluffy, 2 to 3 minutes. Add 1 cup unsweetened applesauce and beat until combined.

3. Place 1 1/2 cups of the all-purpose flour, 1 teaspoon baking soda, 1 teaspoon ground cinnamon, 1/2 teaspoon ground cloves and 1/4 teaspoon ground allspice in a medium bowl and whisk to combine. Add to the applesauce mixture and beat on low speed until combined.

4. Place the remaining 1 tablespoon all-purpose flour, 1 cup chopped walnuts and 1 cup raisins in the now-empty bowl and toss to combine. Add to the cake batter and fold in by hand with a rubber spatula until combined. Pour the batter into the baking pan.

5. Bake until a toothpick inserted in the center comes out clean, 35 to 40 minutes. Let cool completely on a wire rack, then cut into squares to serve.

Make hot rum sauce:

1. Whisk 1 large egg in a small bowl until broken up.

2. Place 1/3 cup granulated sugar, 2 tablespoons cornstarch, and 1/4 teaspoon kosher salt in a small saucepan and whisk to combine. Add 2 cups whole milk, whisk to combine, and bring to a boil over medium heat. Reduce the heat to low and cook, stirring constantly, until the mixture is thickened, 3 to 5 minutes.

3. Add a small amount of the warm sauce to the egg and whisk thoroughly to temper the egg. Pour the mixture into the saucepan and whisk until smooth. Cook, stirring constantly, until the mixture is thickened, 3 to 5 minutes. Remove from the heat. Add 1/4 cup light rum and 1 teaspoon vanilla extract and stir until well-blended. If desired, the sauce can be strained through a fine-mesh strainer before serving.

4. To serve, pour the rum sauce over each cake square. Serve with more warm sauce if desired.

Recipe notes

The cake can be baked up to one day in advance. Cover tightly with plastic wrap and store at room temperature. Serve with the warm sauce. The sauce is best made just before serving.

Leftover applesauce cake can be refrigerated in an airtight container for up to five days, or wrapped in plastic wrap and stored in an airtight freezer-safe container for up to three months. Thaw the cake in the refrigerator overnight. The cake can be enjoyed cold, at room temperature, or warmed in the microwave.

(Kristina Vänni is a contributor to TheKitchn.com, a nationally known blog for people who love food and home cooking. Submit any comments or questions to editorial@thekitchn.com.)

©2021 Apartment Therapy. Distributed by Tribune Content Agency, LLC.