Boullion stock cube is ok: To make it taste better use water that your veggies have been boiled in OR chop up root veg nad leeks into tiny pices and boil for 15/20 mins in the stock, strain through a sieve passing the veg through with a wooden spoon. It makes it taste yummier. Kind of "fake stock".
Problem solved.
Also works excellent for gravy. If you use a beef stock, I tend to fry the tiny bits of veg a bit first along with stock cube. then add water and juice from other meats and veg and loads of pepper. Then you can pass it through all through said sieve, then add a tiny dollop of double cream and a teaspoon of english mustard (or emit completley), and balsamic vinegar.
YUMMY!