Sourdough Onion Bagels

My tiny apartment kitchen filled with the most incredible smell on a rainy Sunday morning—onions slowly cooking down into something sweet and golden, while a jar of bubbly sourdough starter sat on the counter, ready to work its magic. I had been experimenting with sourdough for months, but this was the first time I dared to combine my starter love with my everything-bagel obsession. The result was so completely worth it.

My brother-in-law took one bite of these fresh from the oven and declared them better than any bakery bagel he had ever tasted. He stayed for three hours that day, eating two bagels and asking me to walk him through the entire sourdough process. Now he texts me photos every time he makes his own batch.

Ingredients

• 100 g active sourdough starter: Use a starter that has been fed within the last 8 hours and is bubbly and active
• 400 g bread flour: This high-protein flour creates the chewy texture that makes bagels authentic
• 50 g whole wheat flour: Adds depth and a slight nuttiness that complements the onions beautifully
• 250 ml warm water: Should feel like bath temperature, about 85°F, to activate the starter without killing it
• 1 tbsp honey: Feeds the yeast and helps the onions caramelize while adding subtle sweetness
• 10 g fine sea salt: Fine salt dissolves evenly throughout the dough
• 1 large yellow onion: Thinly slice it yourself for better control over the final texture
• 1 tbsp olive oil: Helps the onions cook evenly without burning
• 1/2 tsp salt: Draws moisture out of onions and speeds up caramelization
• 1 tbsp barley malt syrup: This is the secret to that glossy professional bagel exterior
• 2 liters water: Enough water to boil the bagels properly without dropping the temperature too much

Instructions

Caramelize the onions first:

Heat olive oil in a skillet over medium-low heat, add sliced onions and salt, and cook slowly for 20 to 25 minutes until they are deeply browned and sweet. Let them cool completely before using.

Mix the base:

Whisk together your active sourdough starter, warm water, and honey until the starter is fully dissolved and the mixture looks uniform.

Build the dough:

Add both flours and salt to the wet mixture, stir until it forms a rough shaggy dough, then turn onto a floured surface and knead for 8 to 10 minutes until smooth and elastic.

First rise:

Place the dough in a lightly oiled bowl, cover with a damp cloth, and let rest at room temperature for 4 to 6 hours until doubled in size.

Shape into rounds:

Divide dough into 8 equal pieces, roll each into a tight ball, then poke a hole through the center with your finger and gently stretch to form a 2-inch ring.

Cold proof overnight:

Place bagels on a parchment-lined baking sheet, cover loosely, let proof at room temperature for 1 hour, then refrigerate for 8 to 12 hours.

Preheat and prepare water bath:

Heat your oven to 425°F and bring 2 liters of water with barley malt syrup to a gentle boil in a large pot.

Boil for chew:

Carefully drop each bagel into the boiling water for 45 seconds per side, then remove with a slotted spoon and return to the baking sheet.

Top and bake:

Press the cooled caramelized onions onto each bagel while they are still wet from boiling, then bake for 20 to 25 minutes until deeply golden.

Cool completely:

Let the bagels rest on a wire rack for at least 30 minutes before slicing to prevent the crumb from getting gummy.

Save

The first time I served these at brunch, my friend Sarah asked what restaurant I had ordered them from. Watching her face when I told her I had made them from scratch was absolutely priceless.

Make Ahead Magic

I always caramelize the onions the night before and keep them in the refrigerator. This actually improves their flavor and makes the morning of baking feel much more manageable.

Freezing Instructions

Slice each cooled bagel in half and place in a freezer-safe bag. They thaw beautifully in the toaster and taste almost as good as fresh-baked.

Serving Suggestions

These onion bagels are incredible with plain cream cheese, but try them with softened butter and everything seasoning for an extra savory breakfast.

• Toast them until they are just warm before adding toppings
• Leftover bagels make outstanding sandwich bread for egg and cheese
• Store in a paper bag at room temperature for up to 2 days

Save

There is something deeply satisfying about pulling a batch of these from the oven, knowing they came from patience and a living jar of starter.

Common Recipe Questions

→ What makes these bagels chewy?

The traditional boiling step before baking creates the signature chewy texture. Boiling gelatinizes the starch on the surface, forming that distinctive bagel crust while keeping the inside tender and dense.

→ Can I skip the overnight fermentation?

While you can proof at room temperature for 2-3 hours instead, overnight refrigeration develops deeper sourdough flavor and makes the bagels easier to handle during shaping and boiling.

→ What's the purpose of malt syrup in the boiling water?

Barley malt syrup adds subtle sweetness and helps achieve that professional bakery shine and golden color. Honey works as an excellent alternative if malt syrup isn't available.

→ How do I store these bagels?

Fresh bagels stay good at room temperature for 1-2 days. For longer storage, slice and freeze for up to 1 month. Toast frozen slices directly without thawing for best results.

→ Can I add other toppings besides onions?

Absolutely. Everything seasoning, sesame seeds, poppy seeds, garlic flakes, or coarse salt all work beautifully. Apply toppings immediately after boiling while the surface is still wet.

→ Why use both bread flour and whole wheat?

Bread flour provides high protein for structure and chew, while whole wheat adds nutty flavor and extra nutrition. The combination creates the ideal texture and taste balance.