1 tsp baker's yeast 3 Tbsp instant mashed potato flakes 1/2 cup sugar 1 cup lukewarm water
Every week (or even every few weeks will work), take your starter from its habitual resting place in the refrigerator, let come to room temperature, and add the above mixture (no further yeast needed). Let stand several hours (or overnight). It should get very bubbly.
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