Chiles Rellenos with Tomatillo Sauce

The secret to great chiles rellenos is to use poblano chiles, which have more flavor than the bell peppers sometimes used. Here, the batter is lightened by separating the eggs, beating the whites and yolks separately, and then folding them together. The chiles are lightly floured before they are coated with batter to help the batter stick, and then the stuffed chiles are gently sautéed in butter. This recipe calls for goat cheese, but if you want to stuff the chiles with something milder an