Keens' Steakhouse Prime Rib Hash | Saveur

Ingredients

• 1 large russet potato, peeled and cut into 1/2" pieces
• 2 tbsp. unsalted butter
• ¹⁄₂ small white onion, finely chopped
• 1 stalk celery, finely chopped
• 10 oz. cooked prime rib, cut into 1/2" pieces
• 1 tbsp. finely chopped flat-leaf parsley
• 1 tsp. finely chopped rosemary
• 2-3 tbsp. ketchup
• ¹⁄₂ tsp. hot sauce, such as Tabasco
• Kosher salt and freshly ground black pepper, to taste
• 1 sunny-side-up egg, for serving
• Chopped fresh chives, for garnish