Roasted Onion Sourdough Focaccia

Adapted from Baker Chris Holister's recipe

Chris very kindly shared with me his sourdough focaccia recipe, and this is a version of it that I have adapted for a home baker, topped with roasted onions and a little rosemary. Delicious served with olive oil and labneh, or spread with soft goat’s cheese and herbs.

If you can’t get hold of type 00 or ciabatta flour, use a strong white bread flour.

Chris’s original recipe only requires 90g of starter and two turn and folds of the dough, so if you are making a large batch of dough or are an experienced baker like Chris you may find this is all you need. I found my focaccia was not rising as much I would like and that my dough needed more time, so for this home baker’s version I have increased the amount of sourdough starter for an extra boost and also given the dough a bit more time to prove with a third turn and fold. Adapt it to what works best for you, and the temperature of the day – you may find on a hot day your dough ferments a lot faster and vice versa.


  • 200g sourdough starter
  • 360g water (ideally at 40°C)
  • 450g type 00 or ciabatta flour
  • 90g olive oil
  • 10g salt
  • ½ large onion, finely chopped into rounds
  • rosemary leaves, to sprinkle (optional)
  • sea salt flakes, to sprinkle


The evening before you want to bake, feed your starter to ensure it is very active and bubbly for the following morning.

The next day, weigh the water, sourdough starter and flour into a large bowl.

Mix well then cover and leave for 30 minutes to autolyse.
Next, add the salt and work well into the dough.

Place the dough back in the bowl, cover, and prove for 1 hour in a warm place.

Add half the olive oil and fold into the dough. To do this, imagine 4 sides. Fold the right side to the left, the left to the right, top to bottom, bottom to top.

Prove for another hour, then add the rest of the olive oil and repeat the folding process.

Leave to prove for one remaining hour with one further fold, taking care not to knock the bubbles out of the dough that are developing. The dough should be looking pillowy and bubbly. If it doesn’t, give it some more time.

Lightly oil a roasting tray with sides and gently pour the dough in. Drizzle with some more oil then gently stretch the dough to fill the tray. Leave for 30 minutes.

Stretch it out again if needed and sprinkle with a little flaked salt and the sliced onion. Prod holes deep into the dough using your fingers. You can make these pretty deep, as even though it is a flatbread, it will still rise due to the wild yeast.

Bake in a hot oven at 250°C for 20-30 minutes until baked through. Keep an eye on the dough, and if it is colouring too fast turn the oven down a little. Leave to cool on a wire rack.