Wholemeal Orange Chiffon Cake

Wholemeal Orange Chiffon Cake 
（cooking method）
Ingredients:
4 egg yolk
90g freshly squeezed orange juice
40g Cowhead salted butter
30g Blue Jacket Wholemeal Flour
40g Blue Jacket Cake Flour
1 Tbsp chia seeds
1 orange zest 
4 egg whites
60g fine sugar
Method:
1. Cook orange juice & butter together till butter melted. Add in sifted flours. Mix well. Add in egg yolks slowly. Mix well & set aside.
2. Whisk egg whites till foamy. Add in sugar & whisk till stiff.
3. Add in 1/3 meringue into the cooked dough & fold well. Add in chia seeds & fold till combined.
4. Pour this mixture back to the balance meringue & fold well till the mixture is well mix.
5. Pour into a chiffon tin. Bake in a preheated @160C for 50mins.