Ingredients
Streusel:
3/4 cup all-purpose flour (3 3/4 oz)
3/4 cup granulated sugar (5 1/4 oz)
3/4 cup dark brown sugar (5 1/4 oz)
2 Tbsp ground cinnamon
8 Tbsp unsalted butter, cold, cut into 2 pieces
1 cup (4 3/8 oz) slivered almonds
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8 Tbsp unsalted butter, cold, cut into 2 pieces
1 cup (4 3/8 oz) slivered almonds -
Procedure
Streusel:
In food processor, process flour, granulated sugar, 1/2 cup dark brown sugar, and cinnamon until combined, about 15 seconds.
Transfer 1 1/4 cups (5 1/8 oz) of flour/sugar mixture to small bowl; stir in remaining 1/4 cup brown sugar and set aside to use for Streusel filling.
Add butter and almonds to mixture in food processor
Pulse until nuts and butter resemble small pebbly pieces,
about ten 1-second pulses.
Set aside to use as Streusel topping.
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Ingredients
Cake:
2 Tbsp butter softened for greasing pan
4 large eggs
1 cups sour cream
1/2 tsp almond extract
2 1/4 cups all-purpose flour (11 1/2 oz)
1 1/4 cups granulated sugar (8 3/4 oz)
1 Tbsp baking powder
3/4 tsp baking soda
3/4 tsp table salt
12 Tbsp unsalted butter (6 oz), softened but still cool, cut into 1/2-inch cubes
1/2 cup sour cream (8 oz)
1/2 cup apricot jam -
Procedure
Cake:
Adjust oven rack to lowest position and heat oven to 350 degrees.
Grease 9-inch springform pan with 2 tablespoons softened butter.
Whisk eggs, 1 cup sour cream, and almond extract in medium bowl until combined.
Combine flour, sugar, baking powder, baking soda, and salt in bowl of standing mixer;
mix on low speed for 30 seconds to blend.
Add butter and remaining 1/2 cup sour cream; mix on low speed until dry ingredients are moistened and mixture resembles wet sand, with few large butter pieces remaining, about 1 1/2 minutes.
Increase to medium speed and beat until batter comes together, about 10 seconds; scrape down sides of bowl with rubber spatula.
Lower speed to medium-low and gradually add egg mixture in 3 additions, beating for 20 seconds after each and scraping down sides of bowl. Increase speed to medium-high and beat until batter is light and fluffy, about 1 minute.
Using rubber spatula, spread 2 cups batter in bottom of prepared pan, smoothing surface.
Spoon three 2-teaspoon mounds of jam over batter.
Sprinkle evenly with 3/4 cup streusel filling (without butter or nuts).
Repeat with another 2 cups batter, remaining 1/4 jam (in three 2-teaspoon mounds), and remaining 3/4 cup streusel filling (without butter or nuts).
Spread remaining batter over, then sprinkle with streusel topping (with butter and nuts).
Bake until cake feels firm to touch and long toothpick or skewer inserted into center comes out clean (bits of sugar from streusel may cling to tester), 60 minutes.
Cool cake in pan on wire rack 30 minutes.
Invert cake onto rimmed baking sheet (cake will be streusel-side down); remove tube pan, place wire rack on top of cake, and reinvert cake streusel-side up.
Cool to room temperature, about 2 hours.