2 cups cooked rice (preferably day-old)
1 pound ground beef
1 large onion, diced
1 cup mixed vegetables (such as peas, carrots, and corn)
2 tablespoons soy sauce
1 tablespoon oyster sauce
2 cloves garlic, minced
1 tablespoon vegetable oil
Salt and pepper to taste
2 green onions, sliced (for garnish)