Harvest Pork Roast

1 envelope Lipton's Onion Soup Mix
1 1/2 cups water
1/4 cup soy sauce
2 Tablespoons brown sugar
1/2 teaspoon ground ginger
Pork roast of your choice
4 large yams, peeled and cut in chunks
3 tablespoons water
2 tablespoons flour

Mix first 5 ingredients and place in a slow cooker. Add pork roast and cook on low for 8 hours or overnight, turning meat several times. One hour before serving, turn slow cooker to high and add yams. Just before serving, remove pork and yams to a plate. Mix flour and water and add to remaining juices. Bring to a boil for gravy. Serve gravy over the pork and yams.