Cut sirloin tip into 1 1/2 inch cubes.

Heat vegetable oil in a Dutch oven or large pan.

Brown the beef cubes in the oil.

Add minced onion and cook until tender but not brown.

Stir in flour to coat the beef and onions.

Add remaining ingredients (tomatoes, tomato sauce, paprika, fine herbs, garlic, and salt, if using), except noodles, poppy seeds, and butter.

Cover and simmer for 1 1/2 to 2 hours, or until the meat is tender.

Cook wide noodles according to package directions.

Drain the cooked noodles.

Add poppy seeds and butter to the drained noodles.

Serve the beef goulash over the poppy seed noodles.