Beat eggs in large bowl until light.Add in sugar a little at a time, and continue beating until light and fluffy.
dissolve baking soda in water and stir into egg mixture together with vanilla essence. Combine well until a smooth paste forms.
Heat pan,grease it slightly, and pan fry the mixture into small round cakes of about 3-4inches in diameter. When cakes are cooled,fill two pieces of pancake with desired amount of bean paste.
red bean paste can be substituted by peanut butter, cream, jam or chocolate spread according to your own liking. Makes a great snack for kids.