Beef with vinegar

2 lb beef chuck 1/4 c. all-purpose flour 1 tsp Kosher salt 1/4 tsp freshly-grnd black pepper 3 Tbsp. oil 2 Tbsp. unsalted butter 1 lrg onion cut 1/2"-thk[...]

1 (5 pound) beef brisket salt and pepper to taste 1/4 cup Merlot wine 1/4 cup balsamic vinegar 1/2 cup beef stock 1 (15 ounce) can stewed tomatoes 1 large[...]

3 lbs beef , bottom round Trimmed of most fat and cut into 1 and 1/4-inch chunks sea salt and fresh ground black pepper 1 tablespoon olive oil 1 sweet onion ,[...]