Chocolate Sponge Cake

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Chocolate Sponge Cake\r
Ingredients:\r
5 large egg whites (160 grams)\r
1 teaspoon white vinegar\r
120 grams fine Sugar/or caster Sugar\r
4 large egg yolks (72 grams)\r
90 grams plain flour\r
30 grams cacao powder\r
1/2 teaspoon salt\r
20 grams oil (20 ml)\r
30 grams milk (30 ml)\r
1 teaspoon vanilla essence\r
pan size 18 cm\r
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Baking temperature and time:\r
150°C for 35 minutes, and then 170°C for 3 minutes.\r
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Baking time may vary depending on the type and accuracy of you oven.\r
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Dont need baking powder for this recipe !!!