Hi Warpig, you can buy pickling vinegar in the supermarkets if you want to use that For pickled onions you need small pickling onions. You make up a solution of brine water. 4ozs of cooking salt to 1ltre water to 2lb onions.Heat the water with the salt till it has disolved then put onions in and put aside for 24 hours. Rinse well and put into your jars with the vinegar.......Beetroot needs to be cooked first. You can use pickling vinegar if you wish. My eggs are eaten in 2 months so don`t know the shelf life. It takes everything about 1 month to take up the vinegar which ever one you do. Brown vinegar beetroot, white vinegar the others.