- Mix dry ingredients in a bowl, set aside 
- Mix milk, oil, essence in a separate bowl, set aside 
- Cream yolks with sugar 
- Pour milk mixture into yolk mixture 
- Beat in dry ingredients, a little at a time, until completely combined, set aside 
- Beat egg whites until frothy 
- Beat in sugar, a little a time, followed with lime juice and cornstarch 
- Keep beating until stiff 
- Fold flour mixture into stiffen egg whites, try not to deflate the egg white much 
- Take out some batter, colored accordingly 
- Pipe colored batters onto parchment lined sheet 
- Bake for 1 minute at preheated 325 mins (per each color) 
- Pour the rest of the batter covering colored batter, bake for 15-18 mins 
- Cool cake before spreading filling 
- Whip cream, flavored with syrup and essence 
- Fold in chopped bars 
- Spread filling on cake, roll and let chilled before serving