Cut chuck roast into large, bite-sized pieces and place in a large bowl. Add Southern Art Company Korean BBQ Sauce or Marinade and toss to combine.
Heat a wok over medium-high heat and add oil. Once oil is just smoking, add beef and marinade to wok. Season lightly with salt and pepper. Brown meat on one side, about 2 to 3 minutes, then stir mixture a few times to brown beef on all sides, continuing to cook for 5 to 7 minutes. Use a slotted spoon to remove beef to a plate.
Add zucchini to marinade in wok and stir fry for 3 to 4 minutes until vegetables are slightly softened. Return beef to wok and stir to combine and heat through about 2 to 3 more minutes.
To serve, place cooked rice in 4 bowls. Top with beef and zucchini mixture and garnish with scallion slices and sesame seeds. Serve additional Korean BBQ Sauce or Marinade on the side.