METHOD
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preparation
Place the rack in the center of the oven and preheat the oven to 200 °C / 390°F. Grease a 20 × 30 cm (8-inch x 12-inch) baking pan with a little softened butter.
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bake the phyllo
Cut the phyllo dough in half to fit the shorter baking dish side. Take two sheets at a time, scrunch them up like an accordion, and place them in the baking pan. Repeat the process until the pan is filled. Bake the crinkled phyllo dough for 10 minutes on the middle rack. This helps prevent the dough from becoming soggy when the custard is added later.
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cream filling
In a bowl, mix together the melted butter and olive oil. In a plate or bowl, combine the ground walnuts, sesame seeds, nutmeg, cinnamon, and allspice. Stir to combine. Remove the phyllo dough from the oven and evenly sprinkle the walnut mixture between the layers. Pour over the melted butter and return to the oven, baking on the middle rack for 10 minutes at 180 °C / 350 °F.
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cream mixture
While the cake is baking, prepare the custard. In a bowl, whisk together the heavy cream, milk, eggs, sugar, vanilla sugar, and spices. Pour over the pie after removing it from the oven. Return it to the oven and bake for another 40 minutes at 180 °C / 350 °F.
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sugar syrup
Place the sugar, water, cinnamon, and lemon zest in a saucepan. Bring to a boil over high heat, and once the syrup starts boiling, cook for 5 minutes. Remove from the heat, discard the cinnamon stick and pour over the hot pie, allowing it to soak through and spread evenly inside.
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serve
Set the Walnut Crinkle Cake aside to cool, then cut and serve.