Pour boiling water over asparagus, let sit for 3 minutes. Drain.
Boil 6 cups vinegar in a large pot.
Measure next 8 ingredients into a bowl and gradually add last 2 cups vinegar, stirring to form a paste. Gradually add paste to boiling vinegar stirring constantly until it thickens.
Add asparagus and stir gently until it returns to a boil.
Ladle into hot 250mL jars. Carefully clean rims of the jars. Seal with lids that have been heated in boiling water for 5 minutes. Process jars in a boiling water bath for 5 minutes. Cool for 24 hours and label jars.