Hydration Level and the Crumb You Get
| Hydration | Water per 500g Flour | Crumb Result | Handling Difficulty |
|---|---|---|---|
| 65% | 325g | Tight, uniform, bread-roll texture | Easy — behaves like normal dough |
| 70% | 350g | Slightly open, soft, still fairly dense | Easy, mildly tacky |
| 75% | 375g | Good open crumb, reliable rise | Moderate — needs wet hands |
| 80% (Recommended) | 400g | Large irregular holes, custardy interior | Sticky, but manageable with oiled hands |
| 85% | 425g | Very open and wet, verging on gummy | Difficult — dough will not hold a shape |
| 90% | 450g | Structure collapses; flat and dense-bottomed | Impractical without commercial flour |
Why Eighteen Hours in the Fridge Beats Kneading
Focaccia works because time replaces effort. Kneading exists to align gluten proteins into an elastic network, and it does that by mechanically stretching glutenin and gliadin until they cross-link. But the same network forms on its own if you simply leave a wet dough alone, through a process called autolysis. Water hydrates the flour, enzymes begin cleaving proteins into more mobile fragments, and those fragments spontaneously find each other and bond. The dough is doing the work; it just needs hours instead of minutes. This is why a no-knead dough that looks like paste after mixing will be smooth, extensible and full of structure the next morning without a hand ever touching it.
The hydration level is the single decision that defines the finished crumb. At 80% hydration — 400g of water to 500g of flour — the dough contains far more free water than the starch and protein can bind. That surplus water does two things. During fermentation it lets gas bubbles expand freely rather than being held in a tight matrix, producing the large irregular holes that characterise good focaccia. Then in the oven it turns to steam, and that steam violently inflates the existing bubbles in the first few minutes of baking, which is the oven spring. Lower hydration gives you a tighter, more uniform, more bread-roll-like crumb; it is easier to handle and considerably less interesting.
The long cold rest is where flavour is actually made, and it is not simply slow rising. At refrigerator temperature yeast activity slows dramatically, but the flour's own amylase enzymes keep working almost unabated, breaking starch into simpler sugars. Meanwhile lactic acid bacteria naturally present in the flour produce lactic and acetic acid, along with esters and alcohols. The result after eighteen hours is a dough carrying a genuine depth of flavour that a two-hour warm rise cannot approach, because the warm rise produces plenty of gas but almost none of those slow-forming aromatic compounds. Eighteen hours is the practical minimum; twenty-four is better; past seventy-two the gluten begins to degrade and the dough turns slack and soupy.
Olive oil is a structural ingredient here, not a garnish. Fat is a shortening agent, meaning it physically coats strands of gluten and prevents them from bonding into long continuous sheets. Shorter strands mean a tender, yielding crumb rather than a chewy one, which is why focaccia tears softly while a baguette pulls. The oil in the pan does something different again: with enough of it, the base of the dough is not baking in dry heat but shallow-frying at oven temperature. Oil conducts heat far more efficiently than air, so the underside reaches browning temperature quickly and develops a distinctly crisp, golden, almost fried shell. This is the difference between focaccia and flatbread, and it is why underoiling the pan is the most common failure.
Dimpling looks decorative and is in fact functional. Pressing your fingers to the bottom of the pan collapses the largest gas pockets and creates deliberate wells that pool oil and brine. During baking those wells stay slightly denser and considerably more moist while the ridges between them dry and crisp, giving a single sheet of bread two distinct textures in every bite. The dimples also stop the loaf from doming into a uniform pillow. Dimple firmly and confidently — timid pressing that stops halfway through the dough does nothing except release gas you wanted to keep.
Rosemary and salt both need to be handled with an eye on temperature. Rosemary's aroma comes from volatile terpenes — mainly cineole, camphor and pinene — held in the leaf's oil glands. Scattered dry on top of a loaf baking at 230°C, the fine needles scorch and turn acrid within minutes. Tossing the rosemary in olive oil before it goes on protects it, because the oil both moderates the surface temperature and dissolves those terpenes so they carry into the crumb instead of burning off. Salt should go on as a brine rather than dry crystals: a little water dissolves it enough to season evenly and pull a whisper of moisture to the surface, which encourages browning, whereas dry flakes sit in isolated salty points and draw water out of the crust.
Tray, Oil and the Dimpling Tools
Ingredients
Checklist- 500g Bread Flour (12-13% protein) or strong white flour
- 400g Cool Water (about 20°C) — 80% hydration
- 10g Fine Sea Salt
- 4g Instant Dry Yeast (about 1 tsp)
- 80ml Extra Virgin Olive Oil, divided (60ml for the pan, 20ml for the top)
- 3 sprigs Fresh Rosemary, leaves stripped
- 1 tsp Flaky Sea Salt plus 1 tbsp warm water (for the brine)
- Optional: 1 tsp Honey or Malt Syrup for deeper crust colour
Step-by-Step Method
- 1 Mix the Dough (5 minutes): In a large bowl, whisk the flour, fine salt and yeast together while dry so the salt never sits directly on the yeast. Add all 400g of water and stir with a spatula until no dry flour remains. It will look like a shaggy, unpromising paste — that is correct. Do not knead. Cover the bowl and leave it on the counter for 30 minutes.
- 2 Fold Once, Then Chill: With a wet hand, reach under one side of the dough, stretch it upward and fold it over the centre. Rotate the bowl a quarter turn and repeat three more times. This takes about twenty seconds and is the only handling the dough gets. Cover tightly and refrigerate for 18 to 24 hours.
- 3 Oil the Pan Generously: Pour 60ml of olive oil into the baking pan and tilt it so the base and sides are completely coated. It will look like far too much. It is not — this oil is what fries the base into a crisp shell rather than merely greasing the tin.
- 4 Transfer and Rest: Scrape the cold dough into the pan with an oiled spatula. Do not stretch it yet; cold gluten is tight and will tear. Turn it once to coat the top in oil, cover loosely, and leave at room temperature for 2 to 3 hours until it has relaxed, spread toward the corners and looks visibly puffy and bubbled.
- 5 Dimple and Brine: Heat the oven to 230°C conventional. Mix the flaky salt with the tablespoon of warm water. Oil your fingers, then press them straight down through the dough all the way to the pan base, working across the whole surface — twenty-five to thirty dimples. Drizzle over the remaining 20ml of oil, spoon the salt brine into the wells, and scatter over the rosemary leaves tossed in a little oil.
- 6 Bake (20-25 minutes): Bake on a middle rack for 20 to 25 minutes, until the top is deep golden and the edges have pulled slightly from the pan and gone brown and crisp. If the top is colouring faster than the base, move the pan down a level for the last five minutes. Internal temperature should read 96-99°C if you want certainty.
- 7 Release Immediately: Run a thin spatula around the edge and lift or slide the focaccia onto a wire rack straight out of the oven. Left in the pan it steams itself and the crisp base you just built goes soft within ten minutes. Rest 15 minutes before cutting so the crumb finishes setting.
Diagnosing Focaccia Problems
| What Went Wrong | Most Likely Cause | The Fix Next Time |
|---|---|---|
| Crumb is dense with no big holes | Dough was degassed by over-handling, or the cold rest was too short | One gentle fold only, then a full 18-24 hours cold — never knead or punch it down |
| Base is pale and soft, not crisp | Not enough oil in the pan, or a glass/ceramic dish was used | Use 60ml of oil in a metal pan; oil conducts heat and effectively fries the base |
| Loaf never spread to the corners | Dough was stretched while still cold and fridge-tight | Let it sit at room temperature 2-3 hours first; relaxed gluten spreads on its own |
| Rosemary tastes burnt and bitter | Dry needles scattered onto a 230°C surface | Toss the leaves in olive oil first, which buffers the heat and carries the aroma inward |
| Top browned before the inside cooked | Rack too high, or oven runs hot on the upper element | Bake on the middle rack and drop a level for the final five minutes |
| Went soggy shortly after baking | Left to cool in the pan and steamed itself | Slide it onto a wire rack the moment it leaves the oven |
Test Kitchen Notes
Toppings, Herbs and Sweet Versions
Press 250g of halved cherry tomatoes cut-side up into the dimples before baking, along with a teaspoon of dried oregano. The tomatoes release moisture as they roast, so add three or four minutes to the bake and expect a slightly softer crumb directly beneath them.
Slice one waxy potato paper-thin on a mandolin, toss with oil, salt and thyme, and shingle the slices over the dimpled dough. The potato insulates the surface, so bake at 220°C for 28-30 minutes instead. Starch on starch sounds excessive and is genuinely excellent.
Fold 150g of pitted Castelvetrano or Kalamata olives into the dough during the single fold, and add the zest of one lemon with the rosemary. Reduce the fine salt to 8g, since brined olives contribute a significant amount of their own.
Replace the instant yeast with 100g of active sourdough starter at 100% hydration, and reduce the water to 350g to compensate for the water in the starter. Extend the counter rest before chilling to 2 hours, and expect the cold ferment to need the full 24 hours. Noticeably more acidic and more complex.
Keeping It Soft, and Reviving a Stale Tray
Focaccia is at its peak on the day it is baked and declines faster than most breads because the very open crumb has a great deal of surface area exposed to air. Keep it at room temperature in a paper bag or loosely wrapped in a clean tea towel for up to two days; a sealed plastic bag traps moisture and turns the crisp base leathery within hours. Never refrigerate it, because staling through starch retrogradation happens fastest at refrigerator temperature — a loaf kept in the fridge overnight will be noticeably drier than one left on the counter for two days. Reviving day-old focaccia works remarkably well: sprinkle the cut surface with a few drops of water and warm it in a 200°C oven for five to six minutes, which re-gelatinises the starch and restores most of the original texture. For longer keeping, cut it into portions, wrap each tightly in foil and freeze for up to three months; reheat from frozen at 190°C for twelve to fifteen minutes without thawing, which avoids the sogginess that comes from condensation. Any focaccia that has gone genuinely stale should be cubed, tossed in oil and salt and baked into croutons, or blitzed into the best breadcrumbs you will ever have.
