Scallops with potatoes

2 lbs yukon gold potatoes , peeled, cut into 1-inch pieces 1 teaspoon salt 1/2 cup butter (1 stick) 1 tablespoon butter , room temperature 2/3 cup whole milk[...]

6 ounces green cabbage , shredded 2 tablespoons butter 3 lbs potatoes , peeled and quartered 1 leek , white part about 1 1/2 ounces rinsed well and sliced 1[...]