Place peppers, onions, garlic, and rosemary in blender with most/all the wine and blend until smooth (this is optional, for a thicker sauce, you can leave these rough or fine chopped)
Clean off excess fat from beef if any.
Pour olive oil into bottom of the slow cooker.
Place beef in olive oil.
Add all the remaining ingredients to the pot and stir just to combine.
Set the slow cooker on low and cook for about 6 hours. When the beef starts to pull apart turn the slow cooker down to warm and continue to cook for 12-15 hours. 1-2 hour prior to serving, turn the slow cooker back up to low and cook with the lid cracked. Stir occasionally.
Fork the beef apart.
Serve over pasta.
Notes
1) This produces a lot of sauce good for a large family or if you want to freeze some for later. Consider halfing the recipe if you only want a small amount.
2) Beef is done when you don't need a knife to pull it apart.