In a medium saucepan, cook the carrots, in boiling salted water with a bit of oil, for approximately 15 minutes; take out and put aside.
Using the same water, cook the beans for 3 - 5 minutes; take out and put aside.
Lastly, add the asparagus to the water and cook up to 3 minutes; drain.
Using the same saucepan, gently toss all three vegetables with some butter, add more seasoning, if needed.
Remove the roast from the oven and rest a little before you slice and serve with your vegetables and sauce.