Preparation |
1. Line a 8" x 3.75" x 2.38" baking pan with parchment paper.
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2. Place ingredients A in a small stockpot and heat it up over medium-low heat for about 5 minutes. Do not let it boil but just below boiling point. Turn off the heat and cover stockpot with lid. Let steep for about 15 minutes.
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3. Strain coffee milk with a fine strainer. Let coffee-milk cool slightly till warm before use.
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4. Sift all the flour of ingredients B (cake flour, baking powder, and cocoa powder). Set aside. Preheat oven to 350oF / 180oC.
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5. Bring eggs out from refrigerator and separate the yolks and whites into separate bowls.
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6. Ingredients B: Add 1½ TBSP castor sugar to the yolks.
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7. Ingredients B: Break the yolks and mix yolk and sugar with a hand whisk.
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8. Whisk yolks and sugar for about 2 - 3 minutes until its color turned light and pale.
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9. Stir in vegetable oil until well combined.
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10. Stir in 80ml coffee-milk.
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11. Mix the sifted flour in step 4 into yolk mixture until incorporated.
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12. Set aside the batter.
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13. Get ready with egg whites.
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14. Whisk whites until foamy, about 20 seconds at highest speed. Add vinegar and half of the sugar to the foamy whites. Continue to beat at highest speed for another 1 minute till soft peak. Then, gradually add the remaining sugar.
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15. Continue to beat at highest speed for about 2 minutes to medium-firm peak.
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16. Continue to beat at medium speed for about 1½ minutes until stiff peak or visible obvious trace.
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17. Fold one third of the whites into the batter in step 12.
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18. Cut and fold the remaining whites into batter.
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19. Pour batter into the lined baking pan.
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20. Water bath technique: Fill a larger baking pan with ½-inch of cold or hot water. Place the baking pan in step 19 onto baking pan in step 20. Pop them into the preheated oven and bake at 350oF / 180oC for 30 minutes. Reduce heat to 300oF after about 20 minutes when cake surface is beautifully browned.
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21. Doneness Test: Insert a wooden toothpick in the center of the cake. Cake is done when toothpick comes out clean without any batter sticking on it.
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22. Turn cake upside down onto a wire rack. Remove parchment paper from the cake and leave to cool completely. Cake is ready to serve.
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