Background
Testing the effects of lacto-fermentation on whole and processed grains, comparing standard lacto-fermentations against nixtamalized versions and screening various grain substrates. Barley previously developed complex, cheesy flavors under similar conditions, prompting further exploration across rye, wheat, malt, and oats to see how starch and grain composition affect final flavor and acidity.
Process
Ingredients
- Pearled rye (or other test grains: cracked wheat, malt, rolled oats)
- Water (equal parts by weight to grain)
- Salt (4% of total weight)
- Apple Cider Vinegar (for nixtamalized grain trials: 6% of grain weight)
- Optional starter brine: Active brine from a prior vegetable lacto-ferment for back-slopping
Method
- Standard Grain Ferment: Combine equal parts grain and water with 4% salt by total weight.
- Nixtamalized Trial: Combine equal parts nixtamalized grain and water with 4% salt. Add apple cider vinegar (6% of grain weight) to rapidly lower the initial pH, helping lactic acid bacteria outcompete undesirable microbes.
- Acidification & Safety Note: When fermenting high-starch grain substrates, early acidification is critical to suppress potential pathogens like [[Bacillus Cereus|Bacillus cereus]]. While spontaneous fermentation can work, back-slopping with active starter brine from a vegetable ferment provides a sufficient microbial load to safely colonize the substrate quickly.
Notes and Observations
Trial 1: Pearled Rye vs. Nixtamalized Rye
- Nixtamalized Rye: Developed a distinct sulfurous profile closely reminiscent of hard-cooked egg.
- Standard Rye: Clean, lactic, and grainy. While it lacked the pronounced cheese-like profile seen in barley, it carried a pleasant, mild funk with solid culinary utility.
- Ferment Liquid Yield: The strained brine from both trials was intensely flavorful—well-suited for vinaigrettes, seasoned mayonnaises, or blending into miso.
- Fermented Solids: The softened grains show potential as bread dough inclusions to add acidity and fermented character, or blended smooth into savory grain creams.
Trial 2: Substrate Screenings
- Cracked Wheat (3 days room temp + 3 days cold hold): Brine tasted very similar to fresh mozzarella liquid, though slightly more sour and saline, finishing with a distinct cheesy aftertaste.
- Malt: Developed a pronounced sour beer profile—savory, sharp, and complex.
- Rolled Oats: Sour and tangy with a sharp, goat-cheese-like character; less rounded than the cracked wheat.
- Fermented Rye: Profile landed close to the oats, with a mild, underlying rye earthiness.
Future Adjustments
- Co-Fermentations: Test hybrid batches combining mixed grains or grain-and-legume blends.
- Starter Ratios: Standardize back-slop percentages using mature lacto-brines to establish reliable acidification timelines across high-starch substrates.