Chocolate Marbled Sourdough Bread

Ingredients

For the Plain Sourdough Dough

• 250 g bread flour
• 175 g water
• 50 g active sourdough starter (100% hydration)
• 5 g salt

For the Chocolate Dough

• 225 g bread flour
• 25 g unsweetened cocoa powder
• 175 g water
• 50 g active sourdough starter (100% hydration)
• 20 g sugar or honey
• 5 g salt

Optional Add-ins

• 50 g dark chocolate chips
• 30 g chopped toasted hazelnuts
• 1 tsp vanilla extract

Instructions

1. Mix the Doughs

Prepare each dough separately.

Plain Dough

1. Mix flour and water until no dry flour remains.
2. Rest for 30 minutes (autolyse).
3. Add starter and salt.
4. Mix until incorporated.

Chocolate Dough

1. Mix flour, cocoa powder, sugar, and water.
2. Rest for 30 minutes.
3. Add starter and salt.
4. Mix thoroughly.

2. Bulk Fermentation

1. Place both doughs in separate bowls.
2. Ferment at room temperature (24–26°C / 75–79°F) for 4–5 hours.
3. Perform a set of stretch-and-folds every 30 minutes during the first 2 hours (4 sets total).

The doughs should become smoother and slightly puffy.

3. Create the Marble Effect

1. Lightly flour your work surface.
2. Stretch the plain dough into a rectangle.
3. Stretch the chocolate dough into a similar-sized rectangle.
4. Place one dough on top of the other.
5. Fold the stacked dough in thirds like a letter.
6. Gently stretch and fold once or twice more without overmixing.

Avoid excessive kneading or the colors will blend together instead of creating distinct swirls.

4. Shape the Loaf

1. Shape into a round (boule) or oval (batard).
2. Place seam-side up in a floured proofing basket.

5. Cold Proof

1. Cover and refrigerate for 8–14 hours.
2. The slow fermentation improves flavor and makes scoring easier.

6. Bake

1. Preheat oven and Dutch oven to 250°C (480°F) for 45 minutes.
2. Turn dough onto parchment paper.
3. Score the top with a sharp blade.
4. Transfer to the Dutch oven.

Bake:

• 20 minutes covered at 250°C (480°F)
• 20–25 minutes uncovered at 220°C (425°F)

The loaf is done when the crust is dark and the internal temperature reaches about 96°C (205°F).

7. Cool

Allow the bread to cool completely for at least 1–2 hours before slicing. This helps the crumb set and reveals the marbled pattern.

Tips for Success

Use an Active Starter

Your sourdough starter should be at its peak and able to double in size within 4–6 hours after feeding.

Don’t Overmix the Doughs

Too much folding after combining will create a muddy brown loaf instead of dramatic chocolate swirls.

Add Chocolate Chips Carefully

Fold them into the chocolate dough during the final stretch-and-fold for pockets of melted chocolate.

Hydration Matters

Cocoa powder absorbs water. If the chocolate dough feels stiff, add 5–10 g extra water.

For a Sweeter Loaf

Increase sugar to 40 g and add 75 g chocolate chips.

Serving Ideas

• Toasted with salted butter
• With mascarpone and berries
• Spread with hazelnut chocolate spread
• Used for luxurious French toast
• Paired with coffee or hot chocolate

Yield

• 1 medium artisan loaf (approximately 800–900 g)
• 10–12 slices

The finished bread has a crisp crust, chewy sourdough crumb, mild tanginess, and beautiful ribbons of chocolate throughout every slice.