Though cream may seem a little unexpected, a thick, slightly sour version plays an important role in Mexican cooking, adding a luxurious silkiness to special dishes. Here we use regular heavy cream and add shredded cheese for flavor and as a thickener.
Bring a medium saucepan full of salted water to a boil. Add the potatoes and cook just until tender, 6 to 8 minutes. Drain, pat dry, and spread in a single layer on a baking sheet to cool.
Heat the oil in a large skillet over medium heat. Add the onions, season with the salt and pepper, and cook, stirring occasionally, until they soften and turn golden, 15 to 18 minutes. Stir in the roasted red peppers and poblanos. Add the cream; bring the mixture to a boil, reduce the heat, and let the mixture simmer it until begins to thicken, about 4 minutes. (You can make the filling up to this point a day or two ahead. Cover and refrigerate. Reheat gently over medium-low heat when ready to serve.) Stir in the grated cheeses. Add the potatoes and cook, stirring occasionally, until heated through.
nutrition information (per serving):
filling for one taco;
Photo: Rita Maas