One of the best soups I know is beetroot soup. And if you grow beetroots in your garden, it is all free.
Cook one beetroot per person in clean water. Blend. And serve warm with a teaspoon of sourcream (rømme) and an edible flower, or cold with a teaspoon of sourcream (rømme) and an edible flower.
So far the beetroots in my garden are too small to be harvested, so I had to by some. But next time the soup will be all for free......except for the teaspoon og rømme :-)