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1
Position a rack in the center of the oven and preheat to 375. In a large pot filled halfway with boiling, lightly salted water, cook the potatoes for 3 minutes. Drain and spread evenly on a paper-towl-lined baking sheet to cool.
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2
In a saucepan, melt the butter over medium heat. Add the chopped onion and cook, stirring, until softened, 3 minutes. Whisk in the flour for 2 minutes, then pour in the half-and-half and bring to a boil, whisking constantly; cook for 1 minute. Remove from heat. Stir in the cheese, 1 tsp. salt and 1/2 tsp. pepper. Let cool.
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3
Using a food processor, chop the remaining onion and the carrots. Transfer to a bowl. Add the beet to the processor and chop. Transfer to a kitchen towel, wrap and squeeze out any excess moisture.
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4
Whisk the eggs, marinara, breadcrumbs, 1 1/4 tsp salt and 1/2 tsp pepper into the carrot mixture. Crumble in the turkey, beef and beets and mix well. Transfer to a 9x13 inch casserole dish, pressing in an even layer. top with the potatoes and cheese sauce.
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5
Place the casserole dish on a baking sheet and bake until the edges are bubbly and the top is browned, about 40 minutes. Cover with foil and continue cooking about 20 to 25 minutes until a meat thermometer placed in the center of the loaf registers 175. Let cool for 20 minutes before serving.
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6
Puree the basil, EVOO, lemon juice and 1/2 tsp salt. Serve on top of the meatloaf.