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Bread Sponge
Six potatoes boiled and mashed while hot, two table-spoons of white sugar, two of butter, one quart tepid water; into this stir three cups flour; beat to a smooth batter, add six table-spoons yeast; set over night, and, in the morning, knead in sufficient flour to make a stiff, spongy dough; knead vigorously for fifteen minutes, set away to rise, and, when light, knead for ten minutes; mold out into moderate-sized loaves, and let rise until they are like delicate or light sponge-cake. -Mrs. George H. Rust
A potato sponge bread of the kind that carried most nineteenth-century households through the week. The instructions assume a liquid homemade yeast and a warm kitchen, so those are the two things to translate before starting.
- The yeast is the ambiguitySix tablespoons of "yeast" here means a home-brewed liquid barm or a soft yeast cake dissolved in water, not modern dry yeast. There is no honest one-to-one conversion; for a dough built on a quart of water plus potatoes, about 2 teaspoons of instant or active dry yeast will give a comparable overnight sponge.
- Potatoes carry the recipeSix potatoes means medium boiling potatoes, roughly 2 to 2 1/2 lb. Mash them while hot and with no lumps — the starch is what keeps the crumb moist and feeds the yeast, and cold mashed potato will not blend smoothly into the batter.
- Tepid, and mean it"Tepid water" is roughly lukewarm, somewhere around 85 to 100F. Combined with hot potatoes it is easy to overshoot; let the mash cool to hand-warm before adding the yeast, or the yeast may be damaged.
- Quantities in modern termsOne quart water is 4 cups, and three cups flour makes a loose batter sponge. The morning flour is left unstated — expect several more cups, added gradually, to reach the stiff dough described.
- Overnight timingSet the sponge somewhere cool rather than warm. In a warm modern room the sponge may be over-fermented by morning, and the refrigerator is a practical substitute.
- Fifteen minutes of kneadingBy hand this is accurate and not padding — a potato dough is slack and needs the work. A stand mixer with a dough hook does it in about 8 minutes on medium-low.
- "Like delicate sponge-cake"The final proof cue is texture, not time: the loaf should feel airy and hold a slow-filling dent when pressed. Roughly 45 minutes to an hour in tins at room temperature.
- No oven givenNo oven temperature or baking time is given here. For standard modern loaf pans, 400F for 30 to 40 minutes, until the internal temperature reaches 200-210F, works.
- YieldThis is a large batch by modern standards — four or more 9x5-inch loaves, or a greater number of the "moderate-sized" loaves the recipe specifies. Halving it works without adjustment.
Potato bread was a thrift measure that turned into a preference. Boiled potato stretched expensive wheat flour, and the starch held moisture so a loaf stayed edible for days longer than a plain wheat loaf — no small thing in a household that baked once or twice a week. It also gave unreliable homemade yeast something easy to ferment, which is why so many nineteenth-century "yeast" recipes are themselves potato-based. The overnight sponge method seen here, batter first and stiff dough in the morning, was common American practice before commercial compressed yeast became cheap and dependable, and the principle survives in the modern preferment. The Dixie Cook Book (1883) credits its receipts to the women who contributed them; Mrs. George H. Rust's name on the page is the period's form of a recommendation.