April 8th, 2012
Combine all the ingredients in a saucepan and heat over medium-low heat, stirring until the tahini is dissolved. Transfer to a bowl and set aside to cool. (To store, transfer dressing into a glass jar with a tight-fitting lid; it will keep for a couple of days refrigerated). To serve, add 1 to 2 tablespoons water to dressing.
While waiting for the grill to get hot, combine the sugar, mirin, soy sauce and sesame oil in a large bowl and whisk to mix. Add the mushrooms, leeks, asparagus and snow peas. Toss lightly and set aside.
Place a fine-mesh rack or grilling basket on the grill. Put the mushrooms, leeks and asparagus on the grill over medium-high heat and brush with the marinade. Grill the asparagus until they are slightly charred and the colour has brightened, and 2 minutes. Grill the leeks until slightly charred and soft, about 3 minutes. Transfer to a plate. Put snow peas on grill last and cook until colour brightens, about 1 minute.
When they are cool enough to handle, slice the asparagus, leeks and mushrooms into think diagonal slices. Set aside.
Cook the soba noodles in a large pot of boiling water until soft, 3 to 4 minutes. Drain in a strainer and rinse well with cool water. Squeeze noodles to extract excess water. Transfer to a bowl. Add bean sprouts and grilled vegetables.
Just before serving, add the dressing to the noodles and mix well.