Pound the flank steak to about 1/2" (to help tenderize it).
Spread 3 tbsp of butter on the steak and sprinkle with the thyme, sage, basil, garlic& season with salt and pepper.
With the long side towards you roll up the steak (jelly roll style) and secure with skewers or toothpicks about 1" apart (Make sure it is secure).
Heat olive oil in skillet and brown the outside of the steak, place steak in your crock pot.
In the same skillet brown onions& mushrooms, when browned add tomatoes, tomato paste, chilies, soy sauce, sour cream, bay leaf& worcestershire sauce, mix well and pour over the steak in the crock pot.
Turn to low and cook 5-6 hours; add half the parsley after 5 hours.
Meanwhile cook the linguini so it will be ready in time to serve with the flank steak, drain the linguini, add 2 tbsp butter& remaining parsley; toss.
Cut the Flank steak into 1" slices and put on individual plates along with the pasta, serve with sauce over the steak& the pasta.