How to Make It
Prepare a medium bowl of ice water. In a pot of salted boiling water, blanch the asparagus for 2 minutes. Transfer the asparagus to the ice bath to cool. Drain, chop and transfer to a food processor. Add the mustard, lemon juice and chives. With the machine on, add the oil in a steady stream until well blended. Strain through a fine sieve; discard the solids. Season with salt and pepper. Use on salad greens, grilled steak or roast chicken.