Preheat oven to 180°C bake and grease and/or line a loaf tin (approximately 22cm x 12cm).
Place feijoas, boiling water, Chelsea White Sugar and butter in a large saucepan. Simmer for 5 minutes, then set aside to cool for 5 minutes.
Mix in egg, flour, baking powder and baking soda.
Pour into prepared tin. Bake for 35-45 minutes, until loaf springs back when lightly pressed and a skewer inserted into the centre comes out clean.
Cool in tin for 10 minutes, then transfer to a wire rack to cool completely. Delicious sliced and spread with butter!