Reduce consume and burgundy in large skillet until 1 cup left. Depending on pan and temperature this could take up to an hour
Remove all excess fat from tenderloin and cut into bite size pieces
Brown tenderloin in buttered skillet on high heat DO NOT OVERCOOK ( may still be pink in center)
Salt and pepper meat and set aside
Add whipping cream to wine mixture
Mix Half and half with corn starch slowly add to wine mixture and bring to boil until thickened
Add mushrooms and onion and meat cook on low for 30 mintues
Serve over Mueller's Old Fashioned medium wide egg noodles.