Green soup!

I like to make soups , well really I like to use the leftover vegetables in my fridge and have something warm and comfy to eat at the end of the day. So, here is the recipe for a green soup which is absolutely tasty and I think with as little calories as possible.It serves 2.
Ingredients:
Potato: 1 medium, chopped
Leek:1/2 cup, sliced
Broccoli: 1/2 cup , chopped
Vegetable stock: 1 pint
Salt and pepper
Add all of the ingredients into a pan and let them boil and cook, add salt and lots of pepper ( I really like pepper with my soup). When the vegetables are cooked mash them all with a mixer and you are good to go! If you want to serve it to guests then just add tiny bit of cream fraiche and watercress on the top.