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Preheat oven to 350 degrees.
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Grease a cookie tray or a baking pan (30*40cm) with baking spray. Line a parchment paper with some baking spray and dust with flour. Shake off excess flour and set aside.
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In a bowl using a hand mixer or a stand mixer, beat egg yolks, vanilla essence, and sugar at high speed until thick and pale yellow. Beat for about 10 minutes.
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Add half of the flour to yolk mixture and fold it gently. When it is properly mixed, add rest of the flour and fold it gently. Set aside.
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In a large mixing bowl, beat salt, egg whites, and cream of tartar on a medium speed until soft peaks form. The peaks hold their shape when beaters are lifted.
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Add 2 tbsp sugar and continue beating until whites just hold soft peaks.
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Fold ¼ egg whites into yolk mixture, mix well and then fold remaining whites into yolk mix until it is thoroughly combined.
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In another bowl, pour melted butter and mix half of the prepared cake batter, fold it gently.
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Gently pour the mixture back to the bowl, fold altogether until it is thoroughly combined.
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Spread the batter evenly into the previously prepared pan. Rap the pan once to eliminate air bubbles.
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Bake for 13 - 15 minutes, until the cake is golden and crisp at the edges.
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Dust powdered sugar on to a clean kitchen towel.
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Carefully flip the cake on to kitchen towel. Carefully peel off the parchment paper. Be careful with heat, use oven mitts.
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After peeling sheet, dust with more powdered sugar. Trim the edges. Using the towel, roll up the cake, and once rolled wrap it in the towel. Allow it to cool completely.