This recipe for blueberry banana cake in the Thermomix is perfect for those who love the combination of blueberries and bananas. Made with fresh blueberries and lemon zest, this cake is moist and bursting with flavor. The recipe calls for ripe bananas, which are mashed and mixed with the other ingredients in the Thermomix. The blueberries are then folded into the batter and the mixture is poured into a cake tin and baked in the oven until golden brown. Serve with a dollop of whipped cream or a sprinkle of powdered sugar for a delicious blueberry and banana treat.