INGREDIENTS
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3 tablespoons unsalted butter
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3 tablespoons all-purpose flour
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1 1/2 cup whole milk
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Salt
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Pinch freshly ground nutmeg
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1/2 package no-boil (or the equivalent in fresh) lasagna sheets
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3/4 cups shredded fresh mozzarella
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2 tablespoons olive oil
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1 pound ground beef (85% lean)
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Salt
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1/2 cup chopped carrot
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1/2 cup finely chopped onion
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1 clove garlic, chopped
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1 teaspoon tomato paste
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2 teaspoons all-purpose flour
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Splash red wine (optional)
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1 1/2 cup canned chopped tomatoes, with their juices
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1 cup beef stock or water
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1/2 teaspoon chopped fresh oregano