Soak the flaxseeds in water for 10 minutes or until they form a gel-like mixture. Meanwhile, in a food processor, blitz the oats into flour and blend the bananas into a creamy mash.
In a mixing bowl, combine oat flour, almond meal, starch, and baking powder and add a pinch of salt. Next, incorporate the "flax-egg", mashed bananas, oil, milk, zest and juice of the lemon, and dried rosemary. Mix well into a smooth cake batter.
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{{/ items}} {{^ items}} {{/ items}}Transfer the batter into a 20cm (8 inches) cake tin and bake the cake for 55 minutes at 150°C (300°F).
Leave the cake to cool down and then top it with lemon curd. Finally, garnish with fresh rosemary sprigs and extra lemon zest.