This is a very simple and yummy cake to make from scratch with NO help from a cake mix.Its great for using up eggs. Its light and fluffy, my kids love it, they call it "a smoothie cake" because it tastes like their favorite tropical smoothie... Give it ago. P.S. Over here we can get liquid egg whites in a carton, which is very handy, not to sure if you can get that in the USA!!
Heat oven to 325F. Use an Angel Cake pan 23-25 cm
DO NOT GREASE IT!
Sift flour and 1/2 the castor sugar in a bowl and set aside.
Put Egg Whites in a bowl and whisk with an electric mixer on high for 1 min until frothy. Add the lemon zest, and lemon and passion fruit juices, cream of tartar and salt and continue whisking for 2 mins intil soft peaks form
Whisking on high speed add remainder of sugar 1 tbsp at a time and whisk until soft peaks form
Fold in flour 1/3 at a time with a metal spoon or spatula, gently as not to loose the air.
Transfer the mix to the tin. Place in a heated oven for 30-40 mins or until a skewer comes out clean
Remove the tin from the oven and immediately turn it up side down and support the centre of the tin on a can or jam jar. Leave like this until completely cooled
Whip cream and add 1/2 tsp vanilla extract. Spread on top of cooled cake. Drizzle with squeezed fresh passion fruit.