In a 10-inch enamel-coated cast-iron skillet, heat butter over medium-high heat. Add asparagus and leeks; cook, stirring constantly, for 2 minutes.
In the container of a blender, combine eggs, half-and-half, ½ teaspoon salt, and ½ teaspoon pepper; process until smooth.
Add asparagus and leeks to a greased 9½-inch quiche dish. Pour egg mixture over top, and sprinkle with cheese.
Bake for 15 minutes or until puffed in center.
In a medium bowl, combine tomatoes, arugula, vinegar, oil, remaining ½ teaspoon salt, and remaining ¼ teaspoon pepper, tossing to coat. Serve with frittata.
Notes
KITCHEN TIP: Make sure you use the egg mixture as soon as it is blended to ensure a fluffy frittata.
Recipe by Taste of the South at https://tasteofthesouthmagazine.com/spring-frittata/