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Preheat the oven to 180/350.Gas Mark 4, placing an oven rack in the lower part of it. Grease a 30cm loose-bottomed tart tin.
Roll out the pastry on a lightly floured work surface until it is large enough to line the tin.
Put the beet tops into a pan with just the water that clings to them after washing. Cover with a lid, cook over low heat for about 5 minutes until wilted. Let cool, then drain and spread over the bottom of the pastry case. Sprinkle with the feta.
Put the crème fraiche, eggs and milk into a bowl and beat together.
Pour this mixture into the pastry case and season with salt and pepper. Place on a baking sheet and bake for 40-45 minutes, until just set.
Take the tart out of the oven and carefully slip off the outer ring of the tin, leaving the tart sitting on the base. Return to the oven on the baking sheet for another 5-10 minutes so that the sides get really crisp