First prepare the pumpkins. Preheat the oven to 400ºF / 200ºC degrees.
Use a paring knife to cut around the stems of the pumpkins to remove a lid size section.
Scoop out the seeds and fibers then place both the pumpkins and lids onto a baking sheet.
Sprinkle the inside of each pumpkin with half a teaspoon of sugar and salt.
Roast until tender which will take between 20–30 minutes.
In the meantime, melt the butter in a large saucepan over a medium heat. Add the onion, one teaspoon of salt and strip the thyme leaves also into the pan. Cook for around 5–7 minutes until the onion is softened.
Add the squash and sugar and continue to cook for another 3–4 minutes.
Add the five cups of water and bring to a boil. Simmer uncovered until the squash is tender – around 20 minutes.
Transfer to a blender and blend until smooth.
Return to the pan and stir in the cream and season with salt and pepper.
Serve in the cooked pumpkins topped with sesame seeds and cooked bacon.