2 tablespoons sweet butter or oil 1 medium onion -- finely chopped 3 stalks celery -- thinly sliced 5 sweet potatoes (about 2 pounds) -- peeled and grated 2 large McIntosh apples -- peel, core, grate 5 cups chicken stock or bouillon -- or vegetable stock or bouillon 1 1/2 teaspoons grated orange peel 1/2 teaspoon salt -- or to taste serves 6 to 8 Heat the butter in the pressure cooker. Saute the onions until soft, about 3 m inutes. Add the celery and grated potatoes and toss to coat with the butter. Add the grated apples, stock, 1 teaspoon orange zest, and salt. Lock the lid i n place and over high heat bring to high pressure. Adjust the heat to maintain high pressure, and cook for 4 minutes. Let the pressure drop naturally or use a quick-release method. Remove the lid, tilting it away from you to allow any excess steam to escape. If the soup seems too thin, puree about 1 third of it and stir the puree back i nto the soup. Stir in the remaining 1/2 teaspoon orange zest and salt to taste . Heat thoroughly before serving.
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