Caramelised Onion, Feta & Beetroot Tart

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At the weekend I was down on the allotment and dug the last of the beetroot from the plot (I wanted to dig over that part of the plot in preparation for the new growing season). There were quite a few good ones, but not quite enough to pickle or store for the longer term so I decided to make a tart with them.

I used a sheet of ready-made puff pastry (because that’s what I had), and greased and lined my quiche dish with it, as it takes approx half the sheet of pastry I cut the remainder into...