Add onion and garlic and cook gently until tender.
In a large bowl, combine ground beef, egg whites, mustard, worcestershire sauce, hot pepper sauce, salt and pepper, breadcrumbs, tomato sauce and parsley.
Add cooled onion mixture and knead ingredients to-gether lightly until blended.
Line large loaf pan with foil and place mixture in pan.
Bake, covered in preheated 350 degree oven for 45 minutes.
Combine tomato sauce and mustard for topping.
Uncover meatloaf, brush with topping and bake, uncovered for 25 minutes longer.
Cool for 10 minutes before serving.
Meanwhile, cook potatoes in boiling water until tender, about 20 minutes.
Cook cabbage in boiling water for 10 minutes.
In snall saucepan, heat milk and green onions for 5 minutes.
Drain potatoes, reserving cooking liquid, and mash.
Mash in cabbage, milk green onions, hot pepper sauce, pepper and salt.
Add some reserved cooking liquid if necessary to make potatoes smooth.