Generously season roast with sea salt, pepper, garlic powder and herbs de Provence.
Heat a cast iron pan on med/high heat. When pan is hot add enough butter, ghee or coconut oil to lightly coat the bottom on the pan.
Place roast in pan and brown the first side, turn over and brown the second side (usually about 4-5 minutes a side) While meat cooks: whisk corn starch or arrowroot powder in one tablespoon warm water until smooth.
Add shallots and carrots to crock pot, sprinkle with sea salt, freshly ground pepper, drizzle with cornstarch/arrowroot mixture and toss. Add meat to crock pot, drizzle with Worcestershire Sauce. Place lid on crock pot and cook either 4 hours on high or 8 hours on low. Carve beef against the grain and serve.