Bring water to a boil in a large saucepan; add salt and potatoes. Return to a boil. Cook 5 minutes; drain well.
Melt 1 Tbsp of the butter in cast-iron or large heavy skillet over medium-high heat; add onion and peppers. Cook and stir 2 minutes or until tender-crisp; remove from pan. Add corned beef, potatoes and parsley to onion mixture; mix lightly.
Combine half-and-half, wine, mustard and pepper; add to corned beef mixture and mix well.
Wipe out cast-iron skillet with paper towel; place over medium heat until hot. Add remaining 1 Tbsp butter. Add corned beef mixture, pressing down firmly. Cook hash 15 minutes or until browned, turning with flat spatula several times.
Servings: 8