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1
Preheat oven to 400u00b0F. Line a baking sheet with foil.
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2
Place beet and garlic in center of foil. Pour over half the oil, season and toss to coat. Wrap loosely in foil. Bake for 40-45 mins, until beet is just tender. When cool enough to handle, peel and halve beets.
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3
Meanwhile, in a bowl, combine flour, butter, zest and thyme. Season. Rub in butter to form crumbs. Add 1 egg and stir to form a soft dough. Shape into a disc, wrap in plastic wrap and chill for 30 mins.
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4
Lightly grease an 8 inch springform tart pan. Place on a baking sheet. Roll pastry out between 2 sheets parchment paper to a 9 inch diameter circle. Line pan, letting excess overhang. Line with parchment paper and fill with pie weights.
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5
Bake for 10 mins. Remove weights and paper and bake for 3-4 mins. Trim edges. Reduce oven to 350u00b0F.
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6
Meanwhile, heat remaining oil in a frying pan on a medium heat. Cook onion for 4-5 mins, stirring. Add sugar and vinegar and cook, stirring, for 2-3 mins, until beginning to caramelize. Season to taste.
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7
Whisk together cream and remaining eggs. Squeeze roasted garlic from skins and mash. Add to egg mixture. Season.
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8
Arrange beets, onion and goat cheese evenly over crust. Pour egg mixture over. Bake for 35-40 mins, until just set in center. Allow to cool completely in pan before cutting into wedges to serve.