Arugula and Fontina Frittata

1 garlic clove, halved

1/2 sweet onion, chopped

1 1/2 tablespoons extra-virgin olive oil

7 cups packed arugula, washed and dried

6 large eggs

1/2 teaspoon salt

freshly ground black pepper

1/4 lb Fontina cheese, sharp cheddar, or pepper jack - cut into 1/2" cubes

Preheat broiler (an optional step - read below).  Cook garlic and onion in olive oil in a 10" ovenproof skillet over moderate heat, stirring occasionally until golden.  Add arugula and cook until wilted, about 1-2 minutes.  Whisk together eggs, salt and pepper and pour over arugula in skillet and cook without disturbing over moderate heat until almost set, 5-6 minutes. Add cheese evenly and broil 4-5" from the broiler flame until eggs are just set and the cheese is melted, 1-2 minutes.   If you don't want to turn on the broiler, cover the fritatta for the first 6 minutes and then finish uncovered until the eggs are set.