Place spinach, chives, chopped chervil, ice, kosher salt, pepper, wasabi and stock into blender and puree until smooth. Strain through a bullion strainer into a non-reactive bowl and add yogurt. Whip the cream to stiff peaks* and fold into the yogurt mixture. Hold in the refrigerator until service. Toss ramps with olive oil, and more kosher salt and pepper. Grill over red-hot coals until just charred. Rest for 5 minutes, then slice ramps thinly on the bias.