Drain the tomatoes, reserving the juice for another purpose.

Place a large, ovenproof saucepan over a low to medium heat and gently sauté the onion in a couple of tablespoons of olive oil with a pinch of salt for 12–15 minutes until glossy and translucent, being careful not to let the onion brown. Add the garlic, chilli flakes and oregano and combine, stirring for a few more minutes. Pour in the vodka, increase the heat a little to bring to a very gentle bubble, and cook until the liquid has reduced by a third. Preheat the oven to 140°C.

Now add the drained tomatoes to the saucepan with a good pinch of salt and continue to gently boil for just 1 or 2 minutes, until the oven is ready. Transfer the saucepan to the oven, uncovered, and bake for 30–40 minutes, until the sauce has reduced and has coloured a little on top.

Meanwhile, cook the penne in plenty of salted boiling water. Drain the pasta. Remove the tomatoes from the oven, and add the double cream, sugar and half the Parmesan. Using a stick blender, create a smooth sauce. Immediately add the cooked penne and stir until fully combined. Adjust the seasoning if necessary and serve in four warmed bowls, with the remaining Parmesan on the table.