Pour the white wine into a big pan and also add the white wine vinegar, the black pepper grains, the coriander seeds and the tarragon.
Then cut the shallots in half and clean them. Now cut them. Add them to the pan and then reduce it for 80%.
Meanwhile remove the stem from the magnolia flowers. These have a delicious fresh and aromatic flavor.
Once the liquid has reduced enough turn off the heat and add the flowers. Mix it well and then transfer everything into a bowl. Now cover this well with some foil and let it cool down in your fridge. I always leave it overnight.
Once it has cooled down pass it through a fine sieve and use a ladle to make it a bit easier.
