I tried adding an orange to a banana cake. It worked!
Preheat oven to 180ºC. Grease and line a 9" cake pan.
Place walnuts in TM bowl. Hit turbo a couple of times until nuts are chopped, but not powdered. Tip out and set aside.
Blitz butter, orange zest and sugar 5 seconds/speed 6. Scrape down.
Add the juice from the orange, the eggs and bananas. Mix 15 seconds/speed 4.5. Check that mixture is combined. Scrape down, mix again a few seconds if necessary.
Add the flours, salt and soda to the TM bowl. Mix 15 seconds/speed 4.5. Scrape down. Add reserved walnuts. Mix through with spatula.
Bake 40-45 minutes, or until a cake tester comes out clean.
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