A friend of mine gave me a feijoa cake recipe which I made yesterday and it was really good!
I'm not sure where she got it from, so I cant really credit anyone but her, but I have included it for you below:
Feijoa Cake
Ingredients:
400g drained feijoa pulp (pushed hard into a sieve- use only the pulp, not the juice)
125 g butter, melted
3/4 raw sugar
1 egg, lightly beaten
1 1/2 cups flour
1 tsp baking soda
1 tsp baking powder
1 tsp cinnamon
1/2 tsp ground ginger
Mix the dry ingredients all together, except for the sugar.
In another bowl, mis the feijoa pulp, melted butter, sugar and egg together.
Mix all together well. (yum!)
Pour mixture into a cake tin, and bake at 180C for 35-45 mins, or until a skewer inserted into the cake comes out clean. Cool for 10 mins in tin before turning out.

yum!