Hi Kirsty one of my favourite plants.
I use all of the plant, bulb, leaves and later in the season the flowers too. By the way once it starts to flower the leaves begin to lose some of their flavour but this is made up for as the flowers have an even stronger flavour and aroma, my mouth is watering as I type this.
All parts have a deliciously mild flavour. The leaves, when they are young washed and finely shredded are great in a salad adding just that nice hint of garlic. Once the plant is bit older they really need to be cooked. The whole plant, along with some potatoes and parsley makes a tasty soup.
I actually prefer the taste to normal garlic. Just use it wherever you would have used normal garlic or chives. I just wish I could grow it in my tiny and far too dry garden. However the exercise going into the woods and beside streams to pick some does me good anyhow.