Buttery Pan Roasted Mushrooms And Asparagus - cooking recipe

Ingredients

1/2 small onion, sliced thinly
1 1/2 cups fresh mushrooms, sliced
1 1/2 cups asparagus, 1 inch chopped tips and most tender parts
3 -4 tablespoons butter (no substitutions)
salt and pepper

Preparation

In a heavy frying pan (I like cast iron)cook onion and butter on med-high to high heat until onion is tender.
Add mushrooms and cook until they start to brown, stirring often.
Add asparagus, salt, and pepper to taste and cook until crisp-tender. This dish is best when the asparagus is still a bit crisp and bright green. Serve hot.