Potato Bread
["1 pkg. dry yeast", "1/2 c. potato water (lukewarm)", "1/2 c. butter", "1/2 c. granulated sugar", "3 eggs", "1 c. cooked mashed potatoes (reserving cooking water)", "1 Tbsp. salt", "1 c. all-purpose flour", "1 egg yolk", "1 Tbsp. water"]
["Stir yeast into potato water until dissolved.", "Set aside.", "In a large bowl, cream butter and sugar.", "Beat in eggs, one at a time. Add potatoes and yeast mixture.", "Add salt and milk and mix well. Add flour, 1 cup at a time, until you have a stiff dough.", "Turn out onto a lightly floured board and knead until smooth and elastic. Put dough in an oiled bowl.", "Cover with plastic wrap and refrigerate overnight."]
["yeast", "water", "butter", "sugar", "eggs", "potatoes", "salt", "flour", "egg yolk", "water"]