Purple Sweet Potato Chiffon Cake

(A) 100g Purple sweet potato ~ steamed/boiled & mashed
      3 tbsp milk

(B) 3 egg yolks
      35g castor sugar
      50ml canola oil
      3 tbsp milk

(C) 80g cake flour

(D) 4 egg whites
      50g castor sugar

Directions:

1. Preheat oven to 170 deg C.  Sieve (C) & set aside.
2. Mix (A) until well blended & set aside.
3. Beat egg yolks & sugar till pale & thick; add oil & milk together to combine.  Then add (A) to combine together.
4. Then add (C) & mix well.
5. Whisk (D) until foamy, add sugar gradually & beat until stiff peak.
6. Fold 1/3 egg white into egg yolk mixture & continue to do so until meringue finish.  Fold in gently until well mixed.
7. Pour evenly on paper cup & bake for 20-25 mins.