Adjust oven rack to lower position and heat to 325
Sprinkle meat evenly with salt and let sit for 15 minutes
Process roasted red peppers, paprika, tomato paste, and 2 tsp vinegar in food processor until smooth
Combine oil, onions and 1 tsp salt in Dutch oven, over medium heat, cook down onions till soft (8-10 minutes)
Stir in paprika mixture (2 minutes)
Add beef, carrots, and bay leaf. Stir until coated. Cover pot and transfer to oven.
Cook until meat is almost tender. (2 1/2 hours) stirring every 30 minutes. Add enough beef broth that the surface of the liquid is 1/4 inch from top of meat. Cook 30 minutes longer.
Skim fat from top using a wide spoon.
Stir in remaining 1 tsp vinegar and sour cream. Remove bay leaf, serve over egg noodles.