Asparagus with Easy Hollandaise Sauce and Crispy Onions

Name: Asparagus with Easy Hollandaise Sauce and Crispy Onions
Ingredients: 1 1/2 lb. medium asparagus, washed and trimmed; Extra-virgin olive oil, for drizzling; kosher salt; Freshly ground black pepper; Vegetable oil, for frying; 1/2 onion, sliced thinly on a mandolin; 1/2 c. cornstarch; 2 large egg yolks; 1/2 tsp. Dijon mustard; Juice of 1 lemon, plus 1 tsp. lemon zest; 1/8 tsp. cayenne pepper; 1/2 c. butter, melted; 2 tsp. Freshly Chopped Parsley