1. Sprinkle roast all over with 4 teaspoons salt. Wrap in plastic wrap and refrigerate for at least 18 hours or up to 24 hours. 2. Pat roast dry with paper towels; rub with 1 tablespoon oil and season with pepper. Heat 1 tablespoon oil in 12-inch nonstick skillet over medium-high heat until just smoking. Sear roast until browned on all sides, about 10 minutes. Set roast in slow cooker. 3. Add remaining 1 tablespoon oil to now-empty skillet and heat over medium-high heat until shimmering. Add cremini mushrooms, onion, tomato paste, and 1 teaspoon salt and cook until vegetables have softened, about 5 minutes. Stir in flour to coat vegetables and cook for 1 minute. Slowly whisk in broth until incorporated, scraping up any browned bits. Add porcini mushrooms and thyme and bring to boil. Pour broth mixture around roast. Cover and cook on low heat until meat registers 125 degrees (for medium-rare), 1 1/2 to 2 hours. 4. Transfer roast to carving board, tent with foil, and let rest for 15 minutes. (Leave slow cooker on “warm” setting to keep gravy hot.) Whisk butter and parsley into gravy and season with salt and pepper to taste. Slice roast thin against grain and serve with gravy. ---------------------------------------------------------------------------
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