Potatoes with Green Tahini Sauce

Place potatoes in a large pot, add 2 tablespoons salt and cover with cold water by about 2 inches. Bring to a boil. Reduce heat and simmer until tender, about 15 minutes. Let the potatoes cool to room temperature in the water, 1 1/2 to 2 hours. Drain and cut the potatoes in half.

Combine cilantro, tahini, lemon juice and water in a food processor (or blender); process until very smooth, adding additional room--temperature water by the tablespoon as needed for a smooth sauce.

Toss the potatoes in a large bowl with the tahini sauce, parsley and the remaining 1/2 teaspoon salt. Drizzle with oil just before serving.