Mashed Potatoes With Greens

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Details

8 Ingredients

• 1 9- to 10-oz smoked ham hock
• 4 cups cold water
• 3/4 lb kale, stems removed and reserved, leaves coarsely chopped
• 1/4 lb mustard greens, stems discarded, leaves coarsely chopped
• 3 lbs russet potatoes, peeled, quartered
• 1/2 cup (1 stick) butter
• 1 cup (about) whole milk
• 4 green onions, chopped