1. Preheat the oven to 250C (230C fan-forced).
2. You will need a non-stick ovenproof frying pan or similar,about 30-35cm wide. Cut the pastry about 3cm larger than the diameter of the pan,then chill until needed. Generously grease the pan with the butter and line with a piece of non-stick paper.
3. Slice the tomatoes about 1cm thick,sprinkle over a little salt and set aside for about 10 minutes to draw out some moisture.
4. Place the sugar in a medium frying pan over high heat. Once it turns to a caramel,add the shallot,garlic and vinegar and swirl to combine.
5. Pour the caramel into the lined pan,distributing it evenly. Scatter over the thyme sprigs and season with salt and pepper.
6. Lift the tomato slices out of their juices and shake a little to get rid of any residual liquid. Arrange the slices in the pan in a decorative fashion – they will appear on the top of the tart,so spend a little time getting this right.
7. Dot the tomato with the manchego and the olives,then lay the pastry on top. Bake the tart for 25-35 minutes until golden.
8. Once cooked,rest the tart for 5 minutes,and use a spatula to reshape the overhanging pastry (which will have shrunk back close to the rim) down the sides of the pan. Place a serving plate on top of the pastry,then flip the whole thing over to unmould the tart.
9. Dollop on the goat's curd to serve,and garnish with a few thyme leaves.
*Quality,all-butter puff pastry is essential for this – standard sheets won't do – you can buy this in thick sheets or blocks and roll it out yourself (Careme is a brand I often use).