Preheat oven to 180℃ (fan).
Wrap beetroot in foil and bake in the oven - time depends on the size of the produce, as a guide 30-40 minutes for medium, 50-60 minutes for large.
Slice, dice or cut the beetroot into wedges and pack into warm sterilised jars.
Pour in the hot spiced vinegar mix, making sure that you cover the beetroot.
Seal immediately (refer notes below), and when cool, wipe the jars, label and store in a dark, cool place.
Try to leave approx 1 - 2 cm (half and inch of stem attached to the beetroot when cooking.
Alternative to baking the beetroot is to boil them. If boiling make sure you leave a little stem attached, as mentioned above.
Serving suggestions:
If using Mason or Fowlers jars, you will need to waterbath following manufacturers instructions. However, if you are using lug lidded jars, it is not necessary to waterbath.