Ingredients
Equipment
Method
- In a medium bowl, combine the sirloin tip steak with soy sauce and let marinate for 15 minutes while you prepare other ingredients.
 - Heat vegetable oil in a large Dutch oven over medium-high heat until just smoking. Add mushrooms and onion, cooking until deeply browned and dark bits form on the bottom of the pan, about 8-12 minutes.
 - Transfer the vegetables to a bowl. Add the marinated beef to the same pot and cook until liquid evaporates and meat begins to brown, about 6-10 minutes.
 - Stir in tomato paste and minced garlic, cooking until fragrant, about 30 seconds.
 - Pour in red wine, scraping up browned bits from the bottom with a wooden spoon, and let reduce until syrupy.
 - Add beef broth, chicken broth, carrots, celery, bay leaf, and the reserved mushrooms and onions back to the pot.
 - Bring to a simmer and cook for 25-30 minutes, until vegetables and meat are tender.
 - While the soup simmers, sprinkle unflavored gelatin over cold water in a small bowl and let stand to bloom.
 - When vegetables and meat are tender, stir in the frozen mixed vegetables and cook for an additional 5 minutes.
 - Remove bay leaf, stir in the dissolved gelatin and fresh parsley, and season with salt and pepper to taste.
 - Let the soup rest for 5 minutes before serving to allow flavors to meld.
 
Notes
The unflavored gelatin creates a silky, rich mouthfeel that elevates this soup to restaurant quality. For a heartier version, add cooked barley or small pasta shapes during the last 10 minutes of cooking. Leftovers can be refrigerated for up to 4 days and actually improve in flavor overnight. The soup also freezes beautifully for up to 3 months.
Serve with crusty bread or grilled cheese sandwiches for a complete meal.
