A reader experienced some problem with this recipe I posted so I wanted to do some experiment with it. I have been rather busy with work so thanks for bearing with me. It is quite difficult to explain without pictures so I decided not to reply via comments.
The original recipe which I posted earlier is as below.
Soy Milk Chiffon Cake (Yolk Free)
180g Unsweetened Soy Milk (I used Sobe)
30g Fine Sugar
1/4 tsp Salt
50g Corn Oil
1/2 Tsp Vanilla Essence
110g Cake flour
40g Soy Flour
1/2 tbsp Baking powder
5 Egg Whites
50g Fine Sugar
1/2 Ttsp Cream of Tartar
1) In a bowl, using hand whisk, whisk (A) till incorporated.
2) Add (B) and mix well.
3) In another bowl, using an electric mixer, beat till the whites are frothy. Add in Cream of Tartar and beat till soft peaks. Add in sugar gradually and beat till stiff peaks.
4) Fold in 1/3 of the whites into the mixture using a rubber spatula till incorporated. Pour the mixture to the remaining egg whites and fold in gently till incorporated.
5)Pour into a 21 cm chiffon tube pan. Level the batter with a spatula. Bang the pan on the table to get rid of bubbles.
6) Oil a piece of aluminium foil and cover the pan loosely. Bake at 170 deg.C for 10mins.
7) Turn down the temperature to 160 deg.C and bake for 20mins.
8) Reduce the temperature to 150 deg.C and bake for 10mins. Insert a skewer to check if the cake is done. Remove the foil and bake for another 5 to 10mins to brown the surface.
9) Remove from the oven and invert the pan. Remove the cake from pan when it's completely cooled.
*Note : Mixture (A) will be heavier than your regular egg yolk batter. This is normal due to the extra soy flour used.
**Note : Perhaps I should just replace some of the cake flour with soy flour (toying with idea of 90g cake flour and 30g soy flour) to get a lighter cake. Disregard the yolks entirely and stick to 140g of soy milk.
Below are the correspondence between Hwee Choon and me.
I tried to follow your recipe today but unfortunately the cake turned out to be too dry.
It was already too dry when i tried to mix Group A and Group B ingredients together, even when I have added 200g of Soy Milk instead of 180g. I tried adding another 30g of soy milk but the cake turned out to be too dry. The only difference from your recipe is that I used 150g of cake flour instead of 110g of cake flour and 40g of soy flour.
Also I noticed there is also a harden layer at the top of the cake which I have nvr come across when i bake other favour chiffon cake.
Appreciate if you can advise.
April 7, 2010 12:04 AM
Hi Hwee Choon, first I need to determine if you are the recipe without egg yolk or with egg yolks. Next, when I tweaked the recipe, I have taken soy flour's water absorption into consideration. Thus, amount of soy flour should not be substituted directly with cake flour. Should you use 150g of cake flour, you would need an additional egg to support the cake structure. Substituting egg yolk can be quite tricky as it contains water and fats.
I would like to know if you have added corn oil on top of the 230g of soy milk. Assuming you added these 2 liquids, your hydration ratio is about 53.6%, which will result in a very moist cake. It shouldn't be dry.
The top layer you were refering to is after being inverted?
April 7, 2010 9:29 AM
Thanks for the quick response.
Initially For group A, I used 200g soy milk, 30g castor sugar, 50g corn oil and 1/2 tsp vanilla essence. For group B, I used 150g Cake flour and 1/2tbsp baking powder. No yolk was used. When I added the flour into group A, the consistency of the patter was very "solid" as in it's not as liquid as the patter I always have when baking chiffon cake. And I dont think it's possible to fold in the egg white to the mixture. So I added in another 30g of soy milk.
230g of soy milk is excluding the 50g of corn oil.
The top layer is before the cake is being inverted as in the side that is direct contact with the heat and not the cake pan.
April 8, 2010 2:03 AM
By the way, I did not say that 230gm of soy milk is too dry. What I meant was, your recipe of 180gm of soy milk is too dry after adding the flour. And if I read correctly, your recipe did not include any egg yolks and I did not mention that I added any egg yolks.
Hope this is clear for you.
Thanks and regard
As mentioned in my comments, I do not encourage direct subsitution of soy flour with cake flour. The water absorption between the 2 flours is different. Below is how the batter would look like based on Hwee Choon's direct substitution. 150g cake flour + 180g soy milk + 50g oil.
It is slightly thicker than the normal chiffon cake yolk batter, which was mentioned in my earlier post. But it doesn't look solid to me. Hydration ratio is 65.22%
Soy milk was increased to 200g. Oil remains at 50g. Batter looks smoother, presents ribbon stage when whisk is lfted. Hydration ratio is 60%
Soy milk was incresed to 230g and oil remains at 50g. Batter falls easily from whisk. Hydration ratio is 53.57%
I would suggest that the hydration ratio stays within the 60 to 68 percentage. Too much liquid might hinder the cake from rising as the cake cannot support its own structure.