Peel pumpkin and cut into small pieces, steam till soft and mashed with ½ cup of cream till smooth and creamy. Set aside.
Pour the entire contents of the Roi Thai Tom Yum Soup into a pot, add in the mashed pumpkin and bring to a gentle boil.
Add in the seafood and boil till cooked through. Next add on the mushrooms, once it reaches a boil, turn off the heat, dish up and toss with the spaghetti. Serve immediately.