These are the size of the nettles you should pick. Not huge ones as they taste awful.
4 Medium sized leeks and/or 1 - 3 onions
1-6 Cloves of garlic depending on preference
About a two dozen nettle tops or young nettles (or more) pureed (partially cooked for about 5-10 mins and chopped)
A large bowl of partially cooked oatmeal - This will determine the size of the haggis
Sage, Thyme, Black-pepper to taste
Chopped Fried bacon
Mix all the ingredients together and pack into a muslin bag or clean tea towel and tie the ends. Boil for about an hour and serve with gravy. This recipe is adapted from Richard Mabey's, 'food for free'. I have cooked this without the bacon using a tea towel. The end result was slightly sloppy but after placing in the fridge overnight it became a lot more solid and was very tasty (before and after). If you're going to omit the bacon you may want to add some butter or margarine, or even some fried aubergine .