For the pumpkin slices, peel and finely grate the pumpkin, dice the onion and bacon. Mix all ingredients and let swell briefly.
Spread the mixture on a baking tray and bake in the oven at 160 °C for about 40 minutes. In the meantime, stir together the ingredients for the yogurt sauce.
Arrange the pumpkin slices with the yogurt sauce and serve.