Sour Sourdough - ABM

This is the long-game sourdough for people who want the sharpest possible tang. Where a standard sourdough rises and bakes within hours, this version stretches the process to 24+ hours through cold retarding in the refrigerator. That extended fermentation lets the lactic acid bacteria in the starter do their slow work, producing the punchy tartness that distinguishes truly sour sourdough from the milder commercial stuff.

The bread machine handles the kneading on dough cycle. After the cycle finishes, dough sits for another three to four hours to develop flavor before shaping. Two cylindrical loaves get formed on a cornmeal-dusted sheet, rise for two hours, then refrigerate overnight (the longer the better, the recipe notes).

Cornmeal on the sheet is critical. It prevents sticking during the long cold rise without needing oil, which would soften the crust. The grit also bakes onto the bottom of the loaves for that artisan-bakery rustic finish.

The sprinkle-with-water steps before and during baking create steam that delivers a crispy, crackly crust. Without water, the crust stays pale and soft.

A combination of starter and commercial yeast keeps the rise reliable while still developing strong sour character. Pure-starter sourdoughs can struggle with consistency.

Pro Tips

• Use bread flour, not all-purpose. The higher protein supports long fermentation without collapsing.
• Cornmeal can be replaced with semolina flour for a finer dust.
• The 12-hour minimum cold rest is the floor; 24-36 hours produces noticeably tangier bread.
• Bake on a preheated pizza stone if you have one for an even crispier bottom.

Variations

• Skip the commercial yeast and add an extra two hours of fermentation for a 100% wild-yeast loaf (riskier rise, more authentic).
• Add a tablespoon of olive oil for a softer crumb.
• Sprinkle the tops with sesame or poppy seeds before baking.