Bring 600ml (1 pint) of water to the boil and add the bouillon powder and bouquet garni. Add the celery, carrots, butternut squash and sweet potato and simmer for 5 minutes, then stir through the soya beans. Set to one side whilst you make the dumplings.
Sift the flour and baking powder into a mixing bowl and add the suet, Parmesan and basil. Mix in sufficient water (about 4-5 tablespoons) to make a soft, but not sticky dough.
Put the saucepan of pot au feu back on the heat and remove the bouquet garni. Shape the dumpling mixture into 6 balls, adding them to the saucepan as you make them. Cover the saucepan and simmer for 10 minutes. Serve, garnished with a few fresh basil leaves.
Tip: Make this dish without the dumplings for a low fat dish.