Rocket soup with parmesan cheese

I found this really nice recipe in a book I have bought a few years ago in Ljubljana: Juhe (Kuhinja izbranih okusov). I have tried it (and modified the recipe just a bit, as usually) and it was very nice.


Ingredients:
potato (1 big)
rocket (250 gr)
onion (1 small)
garlic (1 piece)
olive oil (1 spoon)
water (0,5 l)
knorr cube
cream ( 0,2 l)
salt
pepper
parmesan cheese (40 gr)


Cook the potato for about 25 minutes, then drain the water, peel the potato and cut it in small cubes. Clean the rocket and leave some leafs on the side for decoration. Cut the rest of the rocket in small pieces. Peel the onion and garlic and chop in small pieces. Fry them in a pan with a spoon of olive oil. Just before it becomes brown, add the water and the knorr cube, leave it on low heat until the cube melts. Add the cream and mix. Then add the potato cubes and the chopped rocket. Pass the soup through the strainer. Add salt and pepper. Put the soup in a plate, add some rocket leafs on the top and some grated parmesan cheese (it doesn't have to be really thin) and serve.