How to Make It
In a medium bowl, combine the minced shallot and Champagne vinegar and let stand for 20 minutes.
Meanwhile, in a medium saucepan of boiling water, cook the potatoes until they are tender, about 15 minutes. Drain and slice the potatoes 1/3 inch thick.
Prepare a bowl of ice water. In a small pot of salted boiling water, cook the dandelion greens until they are tender, 7 to 8 minutes. Drain and transfer the greens to the ice bath to cool. Drain, squeezing out as much water as possible. Finely chop the greens and transfer them to the bowl with the vinegared shallot. Stir in the minced caperberries, lemon juice and 1/2 cup of olive oil. Season the dandelion salsa verde with sea salt and black pepper.
Spoon some of the dandelion salsa verde onto plates. Top with the warm potato slices and season with sea salt. Garnish with radishes, drizzle olive oil on top and serve.