Pre heat the oven to 180 - 190°C
Dissolve the stock cube in 500ml/ 2 cups of boiling water
Peel the potatoes and cut the top and bottom of each one so they can stand upright with a flat top
Heat up a fairly deep frying pan, suitable for the oven, and spray it with a decent amount of low calorie cooking spray
Turn the potatoes over and cook the other side until it's golden brown
Pour in the stock until the potatoes are half covered. Be careful when you do this as the pan may spit a bit
Place the pan in the pre heated oven. Check them after 30 minutes, they should be soft when stabbed with a knife