Roast Beef with potatoes

1 tablespoon olive oil 1/2 onion , chopped 2 garlic cloves , minced 1 (12 ounce) jar beef gravy 1 (14 1/2 ounce) can diced tomatoes 1 tablespoon italian[...]

1 tablespoon vegetable oil 2 potatoes , sliced thin 1/4 teaspoon pepper 1 teaspoon salt 1 medium onion , sliced 1 lb cooked beef, sliced 2 hard-boiled eggs ,[...]