One of our favorite ways to make asparagus.
1 lb asparagus, trimmed
8oz mushrooms, thickly sliced
1 red onion, sliced
2 tablespoons vegetable oil
1 teaspoon salt
1⁄4 teaspoon pepper
Line a 15 1/2x10 1/2-inch rimmed baking sheet with foil.
Gently toss all ingredients in a large bowl until vegetables are coated with oil.
Spread evenly on baking sheet.
Roast 20 to 25 minutes stirring once until vegetables are slightly charred and tender.
If preparing the asparagus and onion ahead, store them in a plastic bag large enough to accommodate the rest of the ingredients so you won't have to dirty a bowl.