Colcannon Soup

Name: Colcannon Soup
Prep time: 20 min
Cook time: 50 min
Total time: 1 h 10 min
Cuisine: British
Ingredients: 6 Tbsp butter; 2 cups sliced leeks (see How to Clean Leeks); 2 cups sliced and chopped green cabbage; 2 cups sliced and chopped kale (we use lacinato kale); 4 cups peeled and diced Russet potatoes (about 3 pounds, 3/4-inch dice); 6 cups chicken stock (see How to Make Chicken Stock); 2 bay leaves; 2 1/2 teaspoons kosher salt; 1/4 teaspoon white pepper; 1/3 cup heavy cream; 4 green onions, thinly sliced