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Preheat oven to 160°C fanbake. Grease a 20cm-diameter cake tin and line the base with baking paper.
Cut the orange into quarters, remove the seeds and whizz in a food processor until finely chopped.
Dissolve baking soda in water and add to the food processor with butter, sugar, eggs, vanilla and flour. Whizz to combine.
Add sultanas or raisins and walnuts, if using, and stir with a spoon or pulse several times to just combine (don’t whizz them or they will break up).
Pour into prepared cake tin and bake until a skewer inserted into the centre comes out clean (about 1 hour).