▶What is hydration percentage and why does it matter?
Hydration is the ratio of water to flour by weight, expressed as a percentage. A dough with 500g flour and 350g water is 70 percent hydration. Higher hydration (65 to 80 percent) produces a more open, airy crumb with large irregular holes; lower hydration (55 to 65 percent) produces a tighter, closer crumb. Professional bakers express all recipes as percentages of flour weight to make scaling easy. A crusty artisan bread is typically 75 to 80 percent hydration; a sandwich bread is 60 to 65 percent. Higher hydration is harder to handle and requires more skill; lower hydration is easier to work with. Hydration affects extensibility (how far the dough stretches), elasticity (how much it springs back), and the final texture. Understanding hydration is the first step to controlling the bread you make.
▶What is bulk fermentation and how long should it last?
Bulk fermentation is the first rise, where the dough ferments as a single mass in a bowl or tub. During this time, yeast eats flour sugars and produces CO2 (making the dough rise) and organic acids (developing flavor and improving digestibility). Bulk fermentation typically lasts 4 to 8 hours at room temperature (68 to 72 degrees Fahrenheit). You can also do a long cold fermentation in the refrigerator for 12 to 48 hours, which develops more flavor because fermentation slows dramatically at cold temperatures, allowing the yeast and bacteria to work over a longer time. Use a timer and watch the dough: it should rise 50 to 75 percent (not double) during bulk fermentation. Underfermented dough is tight and tastes yeasty; overfermented dough is slack and tastes sour. Getting bulk fermentation right is the key to good bread.
▶What is an autolyse and why should I do one?
An autolyse is a 20 to 60-minute rest between mixing flour and water (but before adding salt and yeast). During the autolyse, flour fully hydrates and gluten develops without yeast activity. This allows the dough to develop strength without fermenting too fast, and it improves dough extensibility (easier to shape). To do an autolyse, mix flour and water together, let it rest, then add salt and yeast and continue. The autolyse is especially important for high-hydration and whole-grain doughs, which benefit from the extra resting time. Not all bakers use an autolyse, but it is a technique used in many artisanal bakeries and produces noticeably better bread.
▶How do I score bread and why is scoring important?
Scoring is cutting the surface of the dough with a sharp blade (lame) before baking. The cut controls where the dough will burst as steam builds inside. A good score is 1/4 inch deep at a 45-degree angle, starting at the top and pulling toward the end of the loaf. The dough will burst along the score, creating an open, attractive crust pattern. Without scoring, steam builds pressure inside and the dough bursts randomly, creating an ugly crust and potentially trapping steam (which can collapse the crumb). A good score also allows the oven spring (rapid rise at the start of baking due to heat expanding gas inside) to push upward and create a taller, more open loaf. Scoring separates amateur bread from professional bread: it is technical, requires a sharp blade and steady hand, and demands practice.
▶What is the difference between yeast and sourdough starter?
Commercial yeast is a pure culture of Saccharomyces cerevisiae (baker's yeast), which ferments dough quickly and predictably. Sourdough starter is a wild culture of yeast (mostly Saccharomyces cerevisiae and Candida milleri) plus lactic acid bacteria, which ferments slowly and produces more acidity and complex flavor. Yeast-based breads are faster (3 to 4 hours bulk fermentation), more predictable, and milder. Sourdough breads are slower (8 to 48 hours fermentation), more complex in flavor, and more digestible (lactic acid breaks down some of the gluten and phytic acid, making it easier on the gut). Sourdough starters require daily feeding and maintenance; yeast is convenient and shelf-stable. Both are valid; yeast is standard in commercial bakeries, sourdough is standard in artisanal bakeries.
▶How do I bake bread with steam and why does steam matter?
Steam is critical in the first 10 to 15 minutes of baking. Bread is baked in a preheated oven at 450 to 500 degrees Fahrenheit, and you need steam to keep the crust flexible so the dough can expand upward (oven spring). Without steam, the crust sets immediately and the dough cannot expand, resulting in a denser, lower loaf. To create steam, you can use a Dutch oven (trap the dough's own moisture inside), a baking stone with a pan of water on the oven floor (create steam from boiling water), or a spray bottle to mist the dough as it goes in (short-lived but helpful). A Dutch oven is the easiest method: place a round loaf in a preheated Dutch oven, cover it, and bake for 20 to 30 minutes covered (trapping steam), then uncover for the last 15 to 20 minutes (allow the crust to brown). The result is a beautiful crust with good oven spring.
▶How do I know when bread is done baking?
An instant-read thermometer is the most reliable method: the interior of bread should reach 205 to 210 degrees Fahrenheit when fully baked. Insert the thermometer into the bottom or side of the loaf, not through the top (you do not want a hole in the crust). The loaf should also sound hollow when you tap the bottom. Color is subjective: it should be a deep golden brown, but ovens vary. A light-colored loaf may be underbaked (gummy crumb), while a dark loaf may be overbaked (dry). If you do not have a thermometer, look for a hollow sound and a deep brown crust. Once you have baked the same recipe many times, you can judge doneness by sight and sound; until then, use a thermometer.
