Meat Loaf With Mushroom Gravy

Name: Meat Loaf With Mushroom Gravy
Ingredients: 2 1/2 tablespoons canola oil; 1 large yellow or white onion, peeled and very finely chopped; 3 ribs celery, very finely chopped; 2 sprigs fresh marjoram, leaves only, very finely chopped; 3 sprigs fresh thyme, leaves only, very finely chopped; Salt and finely ground black pepper to taste; 2 pounds ground beef chuck; 1 1/3 pounds ground veal; 3 eggs, lightly beaten; 1 cup panko bread crumbs; 1/4 cup tomato paste; 3 tablespoons unsalted butter; 1 pound cremini mushrooms, diced; 2 large or 3 to 4 shallots, peeled and finely chopped (about 1/2 cup); 2 tablespoons all-purpose flour; 1 1/4 cups veal stock; 1/2 cup heavy cream; Instant-read thermometer