Diner-Style Turkey Meat Loaf from Lighter, Quicker, Better: Cooking for the Way We Eat Today by Rich

Ingredients

• Salt
• Freshly ground black pepper
• 1 teaspoon fresh thyme leaves or pinch dried thyme
• 3 mushrooms, coarsely chopped
• 2 tablespoons chopped parsley
• ⅔ cup canned tomatoes, with a little puree or juice
• 2 garlic cloves, minced
• 1½ teaspoons olive oil
• 1 onion, chopped
• 1 scallion, halved lengthwise, and thinly sliced
• 1 carrot, chopped
• 1 rib celery, strings peeled and chopped
• 1 tablespoon balsamic or red wine vinegar
• Few drops hot pepper sauce
• 1 tablespoon dark brown sugar
• ½ cup fresh bread crumbs
• 1 egg white, lightly beaten
• 2 tablespoons Dijon mustard, or more as needed, for glaze
• 1½ pounds ground turkey