Season the sirloin cubes with the salt, black pepper, and dried oregano.
Toss the seasoned beef with the flour until evenly coated.
Heat the olive oil in a Dutch oven over medium-high heat.
Add the beef and brown on all sides for 4 to 5 minutes.
Remove the browned beef from the pot and set aside.
Add the white pearl onions, diced sweet potato, and sliced celery to the Dutch oven.
Cook the vegetables for about 5 minutes, stirring occasionally.
Pour in the red wine and chicken broth.
Stir in the tomato paste until well combined.
Simmer for 20 to 25 minutes until the vegetables are tender and the sauce thickens.
Return the beef and any accumulated juices to the pot.
Heat for about 5 minutes until the beef is warmed through.