INGREDIENTS
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2 tablespoons extra-virgin olive oil
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3 tablespoons unsalted butter
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1 medium onion, diced
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3 medium carrots, peeled and sliced
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1 rib celery, sliced
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1/2 pound cremini mushrooms, quartered
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2 cloves garlic, minced
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1 tablespoon kosher salt
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3/4 teaspoon dried oregano
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3 tablespoons tomato paste
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1 pound ground beef
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1/4 cup canned low sodium beef broth
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1/2 teaspoon Worcestershire sauce
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Freshly ground black pepper
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4 cups Mashed Potatoes, recipe follows
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1/4 cup grated Parmesan, optional
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Preheat oven to 375 degrees F.