Garlic Mustard Horseradish
To make the condiment, harvest the entire plant, and wash the roots well. The roots are white and have a horseradish-like smell. They will taste spicy.I chopped the roots.
I blended the roots in a food processor with a bit of salt, a couple teaspoons of water and about 1 teaspoon apple cider vinegar [for paleo use lemon juice] and blended until it looked like horseradish.
From: Food Under Foot: Unleash the Energy of Wild Edibles