Add in the onion, carrot, celery, and garlic; sauté for 4-6 minutes until the vegetables start to soften. Stir in the flour and cook for 1-2 minutes.
Add the broth, rosemary, thyme, sirloin steaks, and barley. Season with salt and pepper.
Cover with a lid and simmer until the barley is tender, about 20-30 minutes (refer to the instructions on the package for cooking time). Taste and adjust the seasoning as needed.
Remove the thyme and rosemary sprigs before serving.
Notes
Pro Tip: Make a bigger quantity and freeze what's left or utilize it throughout the week. Freeze or use within 5 days.