- Preheat the oven to 180°C / 160°C fan.
- Roll the puff pastry into a circle approximately 2.5cm larger than your ovenproof frying pan. Chill until needed.
- Heat the olive oil in a 25cm ovenproof non-stick pan over a medium heat.
- Arrange the shallots cut-side up and cook for around 5 minutes until beginning to colour.
- Add the Merchant Gourmet Whole Chestnuts.
- Sprinkle over the brown sugar, then carefully turn the shallots over and arrange everything neatly in the pan.
- Reduce the heat and add the balsamic vinegar, thyme, rosemary and a splash of water.
- Simmer gently for 5 minutes until slightly thickened. Season with salt and black pepper.
- Remove from the heat and place the chilled pastry over the top, tucking the edges into the pan.
- Bake for 25–30 minutes until the pastry is puffed and deeply golden.
- Leave to cool for 5 minutes.
- Carefully place a serving board or large plate over the pan and invert the tart.
- Finish with extra thyme sprigs and serve.
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