Classic Asparagus Frittata - cooking recipe

Ingredients

2 teaspoons olive oil
1 small onion, thinly sliced
1/4 - 1/2 teaspoon sea salt
3/4 - 1 lb asparagus, cut into 1-inch diagonal lengths
4 large eggs, lightly beaten
1 cup shredded gruyere

Preparation

Heat olive oil in a 10-inch oven-proof frying pan.
Add onions and salt and cook until onions are soft, about 3-mins.
Add asparagus. Cover and reduce heat to med-low.
Cook until asparagus are barely tender, 5-6 minutes.
** preheat broiler while asparagus are cooking.
Pour eggs over asparagus and cook until almost set but still runny on top, about 2-mins.
Sprinkle cheese over eggs and put under broiler. Broil until cheese is melted and lightly brown, about 3 minutes.
Remove frittata from oven, gently loosen the edges, then slide frittata onto a serving plate. Cut into wedges.