About this recipe:Adding polenta to short pastry, be it sweet or savoury, makes the "biting" experience more exciting. Serve with something fresh and sharp, such as a radish and lettuce salad dressed with lemon and garlic vinaigrette. Serves six to eight.
In a food processor, work all the pastry ingredients except the water to fine crumbs, add the water and mix until it starts coming together – if it's still very crumbly and dry, add a tiny splash of water and pulse again.
Tip out on to a work surface lightly dusted with flour, and work until the pastry comes together. Gently roll it out into a roughly 5mm thick round disc. Lifting the pastry with a palette knife, turn it around as you roll, then use a rolling pin to lay it in a deep, 24cm fluted tin. Cut off any excess hanging over the edges and use the offcuts to patch up any gaps. Chill in the freezer for 10 minutes.
Heat the oven to 180 C / Gas 4.
Place a circle of baking parchment on top of the pastry case, fill with baking beans and bake for 20 minutes, until just golden. Remove the paper and beans, and bake for another 10 minutes, or until the pastry is cooked through. Remove from the oven and reduce the temperature to 150 C / Gas 2.
While the pastry is cooking, mix together all the filling ingredients except the chard, then pour into the cooked tart case and dot with spoonfuls of chard.
Bake for 30 minutes, or until the tart is just set and golden. Leave to cool for 10 minutes, remove from the tin and serve warm or at room temperature.
Instead of the swiss chard, you can use spinach, washed, wilted and drained.