Steak in Brown Gravy

Ingredients

• 1 to 1 1/4 pound top round steak
• 1 teaspoon salt
• 1 teaspoon black pepper
• 1 teaspoon garlic powder
• 1½ tablespoons flour
• 2 tablespoons olive oil
• ½ white onion, minced
• 8 ounces mushrooms, sliced
• 3 cups beef stock
• 2 dashes Worcestershire sauce
• 1 green pepper, cut into four pieces
• 1 tomato, halved
• 2 tablespoons fresh chopped parsley, plus more for garnish
• cracked black pepper, for garnish