2 pounds potatoes, such as russet, peeled and cubed
2 tablespoons sour cream or softened cream cheese
1 large egg yolk
1/2 cup cream, for a lighter version substitute vegetable or chicken broth
Salt and freshly ground black pepper
1 tablespoon extra-virgin olive oil, 1 turn of the pan
1 3/4 pounds ground beef or ground lamb
1 carrot, peeled and chopped
1 onion, chopped
2 tablespoons butter
2 tablespoons all-purpose flour
1 cup beef stock or broth
2 teaspoons Worcestershire, eyeball it
1/2 cup frozen peas, a couple of handfuls
1 teaspoon sweet paprika
2 tablespoons chopped fresh parsley leaves