For the Fish Sauce Caramel
1. Boil the beetroot in their skin, depending on size for anywhere between 20 minutes and an hour, depending on size, just until they are tender enough to be cooked through and for their skins to easily rub off when drained and whilst still warm. When skinless and dry, keep in a bowl to one side to cool.
2. For the caramel, add the sugar to an ovenproof pan (like a cast iron) with about 50ml of water and swirl to combine. On a medium-low heat allow the two to melt together, but take care not to stir or agitate the mixture. Allow it to bubble down to an amber colour and add the white wine vinegar and fish sauce to taste. Then, add the butter and swirl to combine into a glossy caramel. Take it as far in colour as you like, but be wary of the caramel burning or becoming bitter the darker it gets.
3. Take off the heat to cool slightly as you heat the oven to 220ºC.
4. Slice your beetroots in quite thick wedges, with the side that will be face-down in the caramel as flat as possible (as this will be upturned for serving and this bottom layer will become the top!) Then, arrange them in the caramel, flat side-down, taking caution as this mixture will be hot. Try to get the surface of the pan covered in beetroot, with no empty spaces.
5. Liberally sprinkle some thyme over the beetroot, then take the pastry out of the fridge and cut a rough size to fit the pan –– don’t be too precious, it doesn’t need to be perfect here, and then top the beetroot with the pastry, gently tucking it in a the sides, so it domes over the filling.
6. Put the pan in the oven, and bake the pastry until it’s crisp, puffed and golden, about 30 minutes or so. Don’t be alarmed if some of the beetroot-y caramel bubbles up onto the pastry and colours it, this is totally normal.
7. Remove from the oven and allow the pan to sit for five minutes (allowing the molten caramel to cool) before upturning your serving plate and - using oven gloves - in one swift motion inverting the pan so the tart faces caramel-side up, pastry side-down. Sprinkle on some more thyme leaves and if you have some chive or garlic flowers add those too, then slice and eat warm.
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