Asparagus and Jack Cheese Frittata

Heat the broiler to high and arrange rack in upper third. In a large bowl, whisk together eggs, cheese, salt, and freshly ground black pepper until thoroughly combined. In a large ovenproof frying pan , heat the oil and the butter over medium-high heat. When it foams, add asparagus , season well with salt and freshly ground black pepper, and cook, stirring occasionally, until cooked through, about 5 minutes. Stir in the cilantro . Reduce heat to low, pour in egg mixture, and cook until a 1-inch border of egg mixture is firm, about 3 minutes. (The center of the frittata will not be set at this point.) Place the pan in oven and broil until some spots are browned and eggs are just set, about 2 minutes. Cut into wedges and serve with a side salad. It can be served warm or at room temperature.