In a large skillet, heat enough olive oil to coat the pain, 2-3 tablespoons. Sauté the asparagus for a couple minutes on medium-high heat. Add the onions & mushrooms (if using). Continue cooking for another 5 minutes, until all the veggies are as tender as you like. If you like your veggies super tender, this may be a 15 minute rice pilaf. :)