Preheat the oven to 400°. In a medium skillet, heat the oil. Add the onion, carrots, celery and garlic and cook over moderate heat, stirring occasionally, until softened, about 8 minutes. Scrape the mixture into a very large bowl and let cool. Add the panko, eggs, mustard, ketchup, Worcestershire sauce, Tabasco, 1 1/2 tablespoons of salt and 1 teaspoon of pepper and stir to form a paste. Using your hands, work in the ground meats and cheese until combined.
Line a large roasting pan with parchment paper. Firmly pat the meat mixture into 2 loaves, about 10 inches long. Arrange the loaves 3 inches apart on the parchment and roast in the lower third of the oven for about 1 hour, until lightly browned and an instant-read thermometer inserted in the center of the loaves registers 150F, about 50 to 60 minutes. Let the meat loaves rest for 15 minutes, then cut into thick slices and serve with the Creamy Onion Gravy.
For the gravy:.
In a large saucepan, melt the butter in the olive oil. Add the sliced white onions and stir to coat. Cover and cook over moderate heat until the onions are very soft but not browned, 10 to 12 minutes. Stir in the flour and cook for about 2 minutes. Add the chicken stock and cook, whisking frequently, until the gravy is thickened, 7 to 8 minutes. Stir in the heavy cream and simmer the onion gravy over moderate heat for about 5 minutes.
Transfer the onion gravy to a blender and puree until smooth. Season with salt and black pepper. Return the onion gravy to the saucepan and simmer until it is reduced to 5 cups, about 5 minutes.

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Nutrition Facts

Per Serving Per 100 g

Amount Per 1 Serving
Calories	669.94 Kcal (2805 kJ)
Calories from fat	448.25 Kcal
		% Daily Value*
Total Fat	49.81g	77%
Cholesterol	198.66mg	66%
Sodium	527.73mg	22%
Potassium	819.47mg	17%
Total Carbs	17.24g	6%
Sugars	4.42g	18%
Dietary Fiber	1.78g	7%
Protein	39.65g	79%
Vitamin C	5mg	8%
Vitamin A	0.3mg	11%
Iron	3.1mg	17%
Calcium	202mg	20%

Amount Per 100 g
Calories	177.01 Kcal (741 kJ)
Calories from fat	118.44 Kcal
		% Daily Value*
Total Fat	13.16g	77%
Cholesterol	52.49mg	66%
Sodium	139.44mg	22%
Potassium	216.52mg	17%
Total Carbs	4.55g	6%
Sugars	1.17g	18%
Dietary Fiber	0.47g	7%
Protein	10.48g	79%
Vitamin C	1.3mg	8%
Vitamin A	0.1mg	11%
Iron	0.8mg	17%
Calcium	53.4mg	20%

* Percent Daily Values are based on a 2000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.
Find out how many calories should you eat.

Tastes

salty
savory
bitter
sweet

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