Serves 4 Ingredients 1 tablespoon olive oil 1 tablespoon unsalted butter 1/2 head Savoy cabbage, shredded 3 scallions, trimmed and chopped 3 garlic cloves, peeled and halved 1/2 teaspoon kosher salt 4 cups chicken broth 2 cups boiled Idaho potatoes, cut in 1/2-inch...