Broccoli Grain Bowl with Steak

Name: Broccoli Grain Bowl with Steak
Ingredients: 1/4 cup oyster sauce, plus more for topping; 2 teaspoons toasted sesame oil; 1 1/4 pounds boneless sirloin steak (about 3/4 inch thick); Kosher salt and freshly ground pepper; 2 tablespoons vegetable oil; 1 10-ounce bag frozen brown rice (about 2 cups); 1 8-ounce bag frozen quinoa (about 1 cup); 1/2 small head Savoy cabbage, chopped; 1 large stalk broccoli, cut into florets; 4 scallions, chopped; 2 tablespoons finely chopped peeled fresh ginger; 6 cloves garlic, finely chopped