Black Pepper Steak

Ingredients

• 1 (1 1/2 to 2 lb.) sirloin steak, 1 1/2 to 2-inches thick
• 2 large onions, thinly sliced
• 1 c. red wine vinegar
• 1/2 c. vegetable oil
• 1/3 c. firmly packed brown sugar
• 1 clove garlic, minced
• 1/4 tsp. salt
• 1/4 tsp. dried whole marjoram
• 1/4 tsp. dried whole rosemary, crushed
• 3 drops hot sauce
• 1 Tbsp. plus 1 tsp. coarsely ground pepper, divided
• tomato wedges
• fresh parsley sprigs