4 or 5 potatoes
1/2 cup sugar
2 tablespoons salt
1 quart boiling water
1 pkg. yeast mixed with 1/2 cup lukewarm water

Add grated potatoes to boiling water and boil five minutes while stirring. Cool.

Add sugar, salt, and yeast cake mixture. Pour into a stone or glass jar, cover, and let stand in a warm place for three hours or more.

Each time the mixture reaches the top of the jar, stir it down. Do this until fermentation ceases, then store, refrigerated in a glass jar.

Use 1/2 cup of this in place of one yeast package in your recipe calling for yeast or starter. When you have 1/2 cup left, use to make this same recipe again in place of the yeast.