How to Make It
Bring a large pot of salted water to a boil. Fill a bowl with ice water. Add the asparagus to the boiling water and cook until crisp-tender, 2 to 3 minutes. Using tongs, transfer the asparagus to the ice water to cool. Drain and pat dry.
Add the potatoes to the boiling water and cook over moderate heat until tender, about 30 minutes. Drain and let cool slightly.
Meanwhile, in a mini food processor, pulse the coriander seeds until coarsely ground. Add the tarragon, parsley and chives and process until finely chopped. Add the Riesling, vinegar and mustard and process until smooth. With the machine on, add the olive oil in a steady stream and process until emulsified. Season with salt and pepper.
Peel and thickly slice the potatoes and transfer them to a bowl. Add 1/4 cup of the dressing, season with salt and pepper and toss gently. Arrange the asparagus on 6 plates and drizzle with some of the dressing. Mound the potatoes on top, drizzle with the remaining dressing and serve.