Spring Salad with New Potatoes and Pickled Spring Onions

(recipe from Smitten Kitchen, online)

2 lbs. small new or fingerling potatoes (a mix of reds and golds is nice)
1 lb. asparagus
1/4 lb. snap peas, green beans or other spring pea
4 small-to-medium radishes, thinly sliced

Pickled Spring Onions
3 spring onions
1/4 cup white wine vinegar
1/4 cup water
1 Tbsp. kosher salt
1 1/2 tsp. sugar (I used honey)

Sharp Mustard Vinaigrette
1/4 cup olive oil
2 Tbsp. whole grain mustard
2 tsp. smooth Dijon mustard
2 Tbsp. white wine vinegar
Salt and freshly ground black pepper to taste

Place potatoes in a medium saucepan and cover with one inch of water.  Bring to a boil and cook for about 15 minutes, or until the tip of a knife easily pierces through a potato.  Drain the potatoes and let them cool until they're almost room temperature.  You can hasten this by covering them with cold water, and replacing the water a few times as it warms up.

Meanwhile, pickle your spring onions.  Whisk vinegar, water, salt, and sugar together in a small container with a lid until the salt and sugar dissolve.  Slice the bulbs and paler green parts into very thin coins and submerge them in the vinegar mixture.  Cover and put in the fridge until you're ready to use them; if you can put them aside for an hour or even overnight, the better.  Reserve the onion greens.

Refill the saucepan you used for the potatoes (here's to fewer dishes!) with salted water and bring it to a boil.  Prepare an ice bath, a large bowl with ice and water in it.  Trim the tough ends off the asparagus.  Once the water is boiling, add the asparagus.  One minute later, add the snap peas.  Two minutes later, drain both together then dump them in the ice bath until chilled.  Drain the vegetables and spread them out on a towel to absorb excess water.

Slice the cooked asparagus spears and snap peas into 1/2-inch segments and place them in a large bowl.  Chop potatoes into moderate-sized chunks and add them to the bowl.  Cut the radishes as thinly as possible.  If they're especially big, you can first quarter them lengthwise.  Cut the reserved onion greens into thin slivers and add them to the bowl.

When you're ready to serve the salad, or an hour or two in advance, whisk the dressing ingredients and toss it with the vegetables, to taste.  (You may find you don't want to use all of it.)  Stir in as many pickled onion coins as you please.  Season with salt and pepper to taste.

Do ahead:  Pickles can be started in the day or days before.  Potatoes can be boiled and chilled in fridge overnight, as can other vegetables.  Vinaigrette can be made in advance as well, but you may want to wait till the last minute to toss it with the vegetables, as the vinegar, over a long sitting time, can ever-so-slightly discolor the cut edges of the asparagus and beans.

(I made this 8/24/11 with the intention of it being for my week's lunches.  Justin came over to drink old-fashioned's and watch Mad Men.  We ended up eating most of the potato salad, too.  Justin said it was the best!  It is ridiculously good, especially if you're a mustard lover like me.)