700g rhubarb, trimmed and cut into 3cm pieces
⅓ cup ...
Make sure the cake tin you use is a really water-tight spring form tin - if it's old or a bit leaky, it'll leak everywhere and make a mess in the oven. Check it first by filling it with water or place a larger tin underneath and watch it closely.
Preheat oven 180˚C and put rhubarb in a single layer in a baking dish. Sprinkle over sugar, zest and vanilla extract and bake for 15 minutes until tender then leave to cool.
In a big jug, beat eggs, yolks ...