Steak and Potato Soup with Mushrooms - Lisa G Cooks

Ingredients

• 1/2 ` tbsp butter
• 227 g cremini mushrooms, (, quartered)
• 8 cups sodium-reduced beef stock
• 2 medium russet potatoes, (, skin on (scrubbed clean), chopped)
• 1 medium onion, (, chopped)
• 6 Sprigs fresh thyme
• 453 g beef ( – left whole (I used sirloin tip), fat trimmed off)
• salt
• pepper
• 1/2 cup cold water
• 1/2 cup cornstarch
• gravy browner