Papas à la Huancaína (Potatoes with Queso Fresco Sauce)

In a medium saucepan, cover the scrubbed potatoes with cold well-salted water. Bring to a boil, then reduce the heat to moderate and simmer until the potatoes are tender, 20 to 25 minutes. Drain well, and set aside to cool

Meanwhile, combine the queso fresco, milk, chile paste and garlic in a blender or food processor and process until very smooth. Season to taste with salt. Set aside.

When the potatoes are cool enough to handle, peel them and cut them crosswise into 1/2-inch-thick slices. Arrange the potatoes on a serving platter and drizzle with the sauce. Sprinkle with the olives, scallions and cilantro and serve.