I use my mums recipe...
Chop 1-2 oninos and fry on butter till soft
Add desired amount of finely chopped bacon (depends how much soup u make- anywhere from 4 rashes +)
Fry, stirring for 5 mins then add chopped pumpkin and some chopped potatoes. Fry for further 10 mins then add water...till it covers the ingredients in the pot. I then add about a table spoon of vegeta.. and let it cook on medium for about 1 hr or hr and a half to let the flavours infuse and till all is soft. Mix with barmix.. or mash up with potatoe masher like i do (but be careful doing this!) and enjoy