Bake bacon on a slotted pan at 375F until lightly crisped, about 10 minutes. Remove and cool to handle.
Season the thin beefsteaks with salt and pepper. Arrange a slice of bacon on each and top each with a small handful of onion, a pinch of garlic and some parsley. Roll and secure each bundle with a toothpick.
Melt 2 tablespoons butter in a Dutch oven over medium to medium-high heat. Brown meat bundles evenly; remove to a plate. Add another tablespoon butter to the pan and sprinkle in flour. Whisk 1 minute then whisk in consomm or stock, milk and Worcestershire. Add meat back to the pan and reduce heat to low simmer. Cover and simmer 75-90 minutes until tender.
Boil potatoes in salted water to tender, 15 minutes. Add green beans in the last 5 minutes to pot to cook along with potatoes.
Remove meat bundles to a platter. Remove toothpicks and drizzle a little gravy over top. Toss drained potatoes and beans with remaining gravy and serve alongside beef bundles.