Take the bread pan out of the breadmaker, add in 260ml water and the flour. Place the bread pan back into the machine, select menu 7 and press start. After around 1 hr the machine will beep and you can add in the additional ingredients.
Chop the onions finely and add them into a pan with olive oil. Fry them for 40 mins on low to medium heat untill they caramelize. Make sure to stir the onions once in a while. Once done, put the onions aside. Grate the pumpkin finely and also put it aside.
When the machine beeps, add the sourdough starter, salt, yeast and the veggies into the breadmaker and press start again to continue the program.
Once the bread is done, take it out carefully and let it cool down completely before cutting it.