Core and roughly cut the pumpkin. Peel and roughly cut the potatoes and onions. Place on a baking sheet that has previously been covered with baking paper.
Bake in a hot oven at 200 ° C top / bottom heat (180 ° C convection) for approx. 25 - 30 minutes. The time may vary depending on the size of the pieces.
After the tray has cooled down a bit, put all the ingredients in a container with the liquid and mix. Season to taste and heat briefly.