Get rubber gloves to peel the salsify and have them ready, because without them there are brown fingers!
Mix 1 tablespoon of flour with the vinegar and add about a liter of very cold water. Put on gloves and brush the roots thoroughly, wash, scrape / peel and wash again. Cut into pieces about three centimeters long and put them IMMEDIATELY in the cold vinegar water. This way they keep their fresh, light color.
Bring some salted water to the boil, pour in 125 ml of milk and boil the well drained (I always rinse them off with fresh water) salsify until half-soft.