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1
Cover the corned beef with cold water and soak overnight in the refrigerator.
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2
Drain the beef and place in a large Dutch oven. Cover with fresh water. Place the yellow peas in a triple layer of cheesecloth and tie securely. Place the bag inside the Dutch oven with the beef. Bring to a boil, then reduce to a simmer and cook for 2 hours.
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3
After 2 hours, add the chopped cabbage, turnip, and carrots to the pot. Simmer for 25 minutes.
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4
Add the chopped potatoes and simmer an additional 20 to 25 minutes, or until all of the vegetables are fork tender.
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5
While the vegetables are cooking, prepare the dumpling dough as follows: Combine the flour, sugar, and baking powder in a bowl, then add the water a little bit at a time to make a pasty dough. You may not need to add all of the water. Divide the dough into 6 balls. Be careful not to over-handle the dough.
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6
During the last 5 to 10 minutes of simmering the vegetables, place the dough balls on top of the vegetables and cover with a lid. Allow the dumplings to steam in the pot for 7 minutes.
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7
When the dumplings are cooked through, remove all ingredients from the pot and arrange on a warm serving platter. Remove the cooked peas from the cheesecloth bag and mash with the butter and black pepper. Serve alongside the beef and vegetables.