Step 1:In a large nonstick skillet, heat the oil. Add the steak and cook, stirring frequently, until the beef is no longer pink and browned, 3 to 4 minutes. With a slotted spoon, remove the beef from the skillet and set aside.

Step 2:Add the snow peas, scallions and sesame seeds to the skillet; stir fry until the vegetables are crisp-tender, 2 to 3 minutes. Return the beef to the skillet. Stir in the broth mixture, and cook until the meat and vegetables are hot and the sauce has thickened, 1 to 2 minutes

Step 3:Cut open the hot potatoes and top them with the beef-vegetable mixture.

Step 1:Coat beef strips with 1 tablespoon flour and salt. Brown beef strips quickly in 1 tablespoon of butter in a skillet. Add mushrooms, onion and garlic; cook until onion is crisp-tender, 3 to 4 min. Remove meat and mushrooms from pan.

Step 2:Add 2 tablespoon butter to pan drippings; blend in 3 tablespoon flour. Add tomato paste. Stir in broth. Stir over medium heat until thick and bubbly.

Step 3:Return meat and mushrooms to skillet. Stir in sour cream; cook slowly until heated through. Do not boil. Serve over hot buttered noodles.