Mixed Berry Muffins

2 pkg active dry yeast1/2 cup warm potato water3 tablespoons sugar1 cup mashed potatoes1/8 teaspoon ground ginger1/2 cup milk2 teaspoons salt6 eggs1-3/4 cups sugar1/2 cup butter or margarine, melted8 to 10 cups flour Dissolve yeast in potato water. Stir in the 3 tablespoons sugar, potatoes, and ginger. Cover; let rise until doubled. Scald milk; add…