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1
Preheat the oven to 350*F.
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2
Grease the bottom and sides of two 9 inch cake pans.
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3
Line the bottoms with parchment paper.
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4
In a medium bowl, sift together the flour, soda,salt and baking powder.
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5
Beat the butter with the sugar until light.
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6
Add the eggs, one at a time, beating well after each addition.
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7
Stir together the buttermilk and the vanilla.
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8
On low speed, add half the buttermilk and mix until incorporated well.
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9
Add half the dry ingredients.
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10
Mix well and then repeat until all dry and wet ingredients are mixed in well.
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11
Stir in the poppy seeds.
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12
Divide the cake batter between the two pans.
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13
Evenly spread it in pans and bake on the middle rack of the oven until a skewer comes out clean, about 15 to 20 minutes.
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14
Cool the cakes in their pans for 10 minutes, then turn out and cool completely.
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15
The cake layers can be made up to 2 days in advance; wrap well and store at room temperature.
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16
To make the filling; cook the blueberries and 1/4 cup sugar in a small saucepan over medium-low heat, stirring often, until the sugar has dissolved and the berries have popped open and become juicey, about 5 minutes.
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17
Let cool to room temperature.
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18
Whip together the creme fraich, cream and remaining 2 TBS sugar until stiff enough to hold it's shape but is still smooth.
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19
To assemble the cake, cut the cake layers in half horizontally using a serrated knife, making a total of 4 layers.
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20
Place a cake layer on a serving plate.
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21
Spread one quarter of the creme fraich filling on top of the cake.
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22
Top with one quarter of the blueberry sauce and then one quarter of the raspberries.
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23
Place a second cake layer on top and spread creme fraich, blueberry sauce, and raspberries on top as you did with the first layer.
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24
Repeat with the third and fourth layers, ending with berries on the top of the cake.
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25
If not serving within an hour, refrigerate the cake.
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26
Once removed from the refrigerator, let sit at room temperature for 15 minutes before serving for optimal flavour.