Heat the oven at 180C and line an oven tray with baking paper. I used 2 small bread trays. Cut the rhubarb in sticks of about 3 cm long and put in a bowl with the lemon juice. In a separate bowl mix the butter, sugar and vanilla until soft and fluffy then add the eggs one by one and keep mixing until well combined. After slowly fold in the flour and baking powder.
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