Instructions:

• Step 1: Preheat your oven to 325°F (163°C). This temperature ensures that your cake bakes evenly and rises beautifully.
• Step 2: In a large mixing bowl, combine the egg yolks, 1/4 cup of superfine sugar, salt, cooking oil, grated orange rind, orange juice, and a few drops of orange coloring. Whisk until the mixture is smooth and well combined.
• Step 3: Gently sift in the self-raising flour into the egg yolk mixture. Fold it in using a rubber spatula until just combined, being careful not to overmix.
• Step 4: In a separate bowl, beat the egg whites with the cream of tartar (or lemon juice) until soft peaks form. Gradually add in the 2/3 cup of superfine sugar, continuing to beat until stiff peaks are achieved.
• Step 5: Carefully fold one-third of the whipped egg whites into the egg yolk batter to lighten it. Then gently fold in the remaining egg whites in two additions.
• Step 6: Pour the batter into an ungreased 9-inch tube pan, smoothing the top with your spatula.
• Step 7: Bake in the preheated oven for 50-60 minutes, or until a toothpick inserted into the center comes out clean.
• Step 8: Once baked, remove the cake from the oven and immediately invert the pan onto a cooling rack.
• Step 9: After the cake has cooled, carefully run a knife around the edges to loosen it from the pan. Gently remove the cake from the tube pan and place it on a serving plate.