Curly dock (also called yellow dock) leaves can be eaten raw when young, or cooked when older, and added to salads or soups. 
Dock leaves are sour while the stems can have a butter-y texture and flavour.
The stems of the dock plant can be peeled and eaten either cooked or raw, and the mature seeds can be boiled, or eaten raw, or roasted to make a coffee substitute. 
We supply young leaves for garnish in punnet and loose leaves in bags.