In a bowl, combine canola or vegetable oil, finely sliced green onions, sugar, salt, Worcestershire sauce, mustard, and pepper.
Pour the marinade over the roast, ensuring even coverage.
Cover and marinate overnight in the refrigerator, turning the roast several times.
Bring the marinade to a boil in a saucepan and simmer for several minutes.
Grill the roast over medium heat for 15 to 20 minutes.
Turn and cook for another 15 to 20 minutes, or longer if desired.
Remove from the grill and carve the roast across the grain into slices.
Spoon the marinade over the top.
Notes / Tips / Wine Advice:
Wine Advice:Pair this delightful Grilled Chuck Roast with a medium to full-bodied red wine such as Merlot or Cabernet Sauvignon. The robust flavors of the roast will complement the rich and velvety notes of these wines. Enjoy a satisfying and hearty meal!