Sourdough Focaccia With Caramelized Onions

There is something magical about the combination of bubbly, fermented sourdough and the deep, jammy sweetness of caramelized onions. This Sourdough Focaccia With Caramelized Onions is the ultimate comfort bread. It features a crisp, golden-brown bottom, a pillowy interior filled with air pockets, and a savory-sweet topping that will have your kitchen smelling like a gourmet French bistro. Whether you are a seasoned bread baker or just starting your sourdough journey, this recipe delivers impressive results with a hands-off approach that lets time do most of the work.

Recipe Information

• Prep Time: 30 minutes active (plus 18 hours fermentation)
• Cook Time: 25 minutes
• Total Time: 18 hours and 55 minutes
• Servings: 12 servings
• Difficulty: Medium

Nutrition values

• Calories: 245 kcal
• Protein: 6g
• Carbs: 38g

Why Make This Sourdough Focaccia With Caramelized Onions

This recipe transforms humble pantry staples into a masterpiece. Sourdough focaccia is much more digestible than standard yeast breads because of the long fermentation process. The natural acidity of the sourdough perfectly balances the rich, sugary notes of the onions. It is incredibly versatile; you can serve it as a side for dinner, use it for the best sandwiches of your life, or simply snack on it with a glass of wine. Plus, the high hydration of the dough makes it forgiving and fun to dimple with your fingers.

Ingredients

• 100g active sourdough starter (bubbly and fed)
• 375g lukewarm water
• 500g bread flour (or all-purpose flour)
• 10g fine sea salt
• 50g extra virgin olive oil (plus more for the pan and drizzling)
• 2 large yellow onions, thinly sliced
• 1 tablespoon butter
• 1 tablespoon balsamic vinegar
• 1 teaspoon fresh thyme leaves
• Flaky sea salt for finishing

Directions

Step 1: Mix the Dough

In a large mixing bowl, whisk together the active sourdough starter and lukewarm water until the starter mostly dissolves. Add the bread flour and sea salt. Mix by hand or with a sturdy spatula until a shaggy dough forms and no dry flour remains. Cover the bowl with a damp cloth and let it rest for 30 minutes to autolyse.

Step 2: Stretch and Fold

Perform a series of stretch and folds to build strength in the dough. Reach under one side of the dough, pull it up high, and fold it over the center. Rotate the bowl and repeat this four times. Repeat this entire process every 30 minutes for a total of four sets. You will notice the dough becoming smooth and elastic.

Step 3: Bulk Fermentation

Cover the bowl tightly with plastic wrap or a lid. Let the dough sit at room temperature for 8 to 12 hours, or until it has nearly doubled in size and looks bubbly. The exact time depends on the temperature of your kitchen. Once doubled, transfer the dough to a well-oiled 9×13 inch baking pan. Gently stretch it toward the corners, cover, and let it proof for another 2 to 4 hours (or overnight in the fridge for better flavor).

Step 4: Caramelize the Onions

While the dough performs its final proof, melt the butter and a splash of olive oil in a skillet over medium-low heat. Add the sliced onions and a pinch of salt. Cook slowly for 30 to 40 minutes, stirring occasionally, until the onions are deep golden brown and soft. Stir in the balsamic vinegar and thyme during the last 2 minutes of cooking. Remove from heat and let them cool completely.

Step 5: Dimple and Top

Preheat your oven to 425°F (220°C). Drizzle a generous amount of olive oil over the proofed dough. Use your fingertips to press straight down into the dough to create deep dimples all over the surface. Spread the cooled caramelized onions evenly across the top, gently pressing some into the dimples. Sprinkle with flaky sea salt.

Step 6: Bake and Cool

Place the pan in the center of the oven and bake for 20 to 25 minutes. The edges should be dark golden brown and the onions should look slightly charred. Remove from the oven and immediately transfer the focaccia to a wire rack to prevent the bottom from getting soggy. Let it cool for at least 15 minutes before slicing.

Expert Tips for Perfect Sourdough Focaccia With Caramelized Onions

Use high-quality extra virgin olive oil; it provides the primary flavor for the crust. If your dough is resisting when you stretch it into the pan, let it rest for 15 minutes and try again; this relaxes the gluten. For the best dimples, ensure your fingers go all the way to the bottom of the pan. Always let your caramelized onions cool before putting them on the dough, as hot onions can “cook” the top layer of dough prematurely and ruin the rise.

Delicious Variations

You can easily customize this focaccia to suit your taste. Add some crumbled goat cheese or gorgonzola along with the onions for a salty kick. For a herb-forward version, add chopped rosemary or sage to the dough during the stretch and fold process. If you like a bit of heat, drizzle some hot honey over the finished bread. You can also add roasted garlic cloves or pitted kalamata olives for even more Mediterranean flair.

Frequently Asked Questions

Can I use sourdough discard for this recipe?

While you can use discard, the rise will be much slower and the bread might be denser. For the fluffiest focaccia with the best air pockets, it is highly recommended to use an active, bubbly starter that was fed 4 to 8 hours prior to mixing.

What is the best pan to use for focaccia?

A metal 9×13 inch baking pan or a large cast-iron skillet works best. Metal conducts heat efficiently, which helps create that signature crispy, fried bottom crust that everyone loves.

How do I know when the bulk fermentation is finished?

Look for visual cues rather than the clock. The dough should have doubled in volume, have visible bubbles on the surface, and feel very jiggly when you gently shake the bowl.

Can I make the dough ahead of time?

Yes! After the stretch and folds, you can put the dough in the refrigerator for up to 48 hours. Cold fermentation actually develops a much deeper, more complex sourdough flavor and makes the dough easier to handle.

How should I store leftovers?

Store leftovers in an airtight container at room temperature for up to 2 days. To refresh the bread, toast it in a 350°F oven for 5 minutes to bring back the crispiness. You can also freeze sliced portions for up to 3 months.

Conclusion

Making Sourdough Focaccia With Caramelized Onions is a rewarding process that yields professional-bakery results at home. The slow fermentation creates a complex flavor profile that pairs beautifully with the rich, balsamic-infused onions. It is a show-stopping bread that works for holiday dinners or casual weekend brunches. Once you master this base recipe, you will find yourself making it on repeat. Enjoy the process of dimpling the dough and the incredible aroma that fills your home as it bakes!