This moist almond cake boasts caramelized plums and a buttery, spiced topping. Toasting almond slicons adds an extra crunch.
Preheat the oven to 350°F (175°C). Grease and parchment-line a 9-inch round cake pan.
In a light-colored saucepan, melt 10 tbsp butter over medium-low heat. Cook until butter is browned (5-7 minutes); transfer to a large bowl and cool for 10 mins.
Melt the remaining butter in the same saucepan or over very low heat; pour into the prepared pan. Sprinkle with brown sugar, cinnamon, and nutmeg; mix and spread into an even layer. Arrange plum halves over the mixture, pressing gently into the pan until covered.
For the cake batter: Add sugars, salt, cinnamon, and nutmeg to the cooled browned butter. Mix well, then incorporate almond flour (mixture will be grainy). One by one, beat in the eggs; mix well after each addition. Use an electric mixer to beat mixture on medium-high speed for 3 mins until light and fluffy. Add lemon juice, vanilla, and almond extracts; mix. Reduce speed, and fold in flour and baking powder just until combined.
Pour batter over plums; spread gently. Bake for 45-55 mins or until the cake is golden brown and<dummy00019>1 springs back when touched.
Let cake cool in pan for 10 mins before inverting onto a serving platter. Peel off parchment; let cool completely.
Before serving, sprinkle with toasted almond slices if desired.
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