Healthy Ground Beef Stroganoff

Ingredients

• 1.5 tablespoon olive oil
• 1 small onion (finely diced)
• 1 lb ground beef (93-95% lean or 5-7% fat content, about 450-500 grams)
• 7 oz mushrooms (sliced or diced, about 200 grams)
• 2 teaspoon minced garlic (or 2 cloves of garlic)
• 1 teaspoon salt
• ½ teaspoon pepper
• 1 teaspoon Dijon mustard
• 1 tablespoon Worcestershire sauce
• 2 teaspoons soy sauce
• 1 cup chicken stock
• 1 tablespoon tomato paste (optional but recommended)
• 3 cups baby spinach
• 1 tablespoon flour (regular or gluten-free)
• 1 cup light sour cream
• To Serve: Pasta (rice, or quinoa)