Heat your oven to 425 degrees.
Spread the bread cubes on a baking sheet and toast in the oven about 8 minutes.
Using a sharp, small knife, cut out a 3 or 4 –inch circle from around the pumpkin stem and set it aside. Scrape out the seeds and loose stringy bits using a large metal spoon or your hands.
Put the pumpkin in a roasting pan and sprinkle ½ teaspoon salt inside. Arrange a layer of the toasted bread on the bottom of the pumpkin.
Stir together the broth and crème fraîche. Add the remaining teaspoon salt, nutmeg and pepper to the mixture and stir again until dissolved.
Pour about a third of the broth over the bread, followed by a third of the cheese. Continue layering twice more and top with the bay leaf. Replace the pumpkin top and carefully place in the oven.
Bake for 1 hour. Turn the oven down to 375 degrees and bake for another 30 minutes.
At this point, take the pumpkin out of the oven and gently poke it with a skewer or the point of a knife – there should be very little resistance, but should still hold its shape. If it still feels a bit firm, put it back in the oven and test it at 15-minute intervals until if feels done – try not to over cook so that the pumpkin doesn’t start to slump or cave in. There goes your tureen.
To serve, carefully spoon out some broth, bread and pieces of pumpkin (you have to scrape the sides a bit to break up the flesh). As you get toward the bottom of the pumpkin, some liquid might begin to leak out – keep the pumpkin in the pan or another large bowl just in case.