Sourdough Discard Soft Pretzels: Bavarian Style

An alkaline bath gives a pretzel its characteristic crust. Traditional lye-treated pretzels generally have a darker, shinier surface and more intense flavor than those made with ordinary baking soda. The treatment you choose also changes the handling precautions.

This recipe combines sourdough discard with commercial yeast. Discard contributes flour, water, acidity, and fermented flavor; its condition can also affect dough strength and fermentation. It may still contain active yeast, so it is inaccurate to treat every discard as an inert flavoring. The added yeast makes a same-day schedule practical, but it cannot guarantee an exact rising time.

What the Discard Changes

The 150g of 100% hydration starter contributes 75g flour and 75g water. Together with the added flour and water, the formula contains 575g flour and 315g water: about 54.8% hydration, before the small water contribution from butter and syrup. This is a stiff dough.

Use discard from an established, regularly maintained starter. Keep collected discard refrigerated and use it promptly. Its acidity, yeast activity, and flavor depend on feeding and storage history; there is no single pH or tenderizing effect that applies to every jar. Acidity alone does not guarantee a darker crust.

Do not use discard from a new culture that has not established a consistent rise-and-fall cycle. Discard the entire starter or collected discard if it develops mold, pink or orange discoloration, or a putrid smell. Do not taste raw dough or discard to judge safety. King Arthur’s starter guidance explains signs of spoilage, and its sourdough teaching guide distinguishes established discard from the early culture-building stage.

Choosing and Handling the Bath

Ordinary baking soda is the simplest option here. It is less caustic than lye, but a simmering bath can still scald. Use a large pot, avoid splashes, and keep children away from the hot liquid.

Baked baking soda is sodium carbonate-rich powder. It is a stronger alkali than ordinary baking soda. Avoid dust and contact with skin or eyes; wear suitable gloves and eye protection while handling the powder and solution. The ILO/WHO chemical safety card identifies serious eye irritation and skin and respiratory irritation. Do not substitute a laundry cleaning product for a food ingredient.

Food-grade lye is sodium hydroxide. It can severely injure skin, eyes, and the respiratory tract. Use only a product explicitly labeled for food use; a purity percentage alone is insufficient. Drain cleaner and soap-making material without a food-grade specification are not appropriate substitutes.

For lye handling:

• Wear splash-rated goggles, gloves rated by their manufacturer for sodium hydroxide, and clothing that protects exposed skin.
• Use a stable, compatible stainless-steel bowl and utensils. Avoid aluminum and other incompatible metals, and keep lye away from acids and cleaning chemicals.
• Work with ventilation, keep children and pets away, and avoid breathing dust or mist. Sodium hydroxide is not a harmless inhalation exposure.
• Add pellets slowly to cold water, stirring carefully. Dissolving lye releases heat; allow the solution to cool before dipping. Keep the bowl labeled and attended.
• Follow the product’s directions and local requirements for disposal. Do not assume every drain, septic system, or mixing practice is suitable.

NIOSH’s sodium hydroxide entry describes the chemical hazards. For an established culinary demonstration, see King Arthur’s lye and baking-soda pretzel comparison. Accurate concentration, complete dissolution, draining, and baking all matter; baking does not make an arbitrary dosing mistake safe.

If exposure occurs: Immediately rinse skin or eyes with plenty of running water and obtain urgent poison-control or medical guidance. Remove contaminated clothing while rinsing. Eye exposure needs immediate medical attention. Do not apply vinegar or another neutralizer to the body. ATSDR’s sodium hydroxide guidance explicitly advises against neutralizing substances on affected skin.

Ingredients

Makes 8 pretzels from approximately 950g dough: about 119g (4.2 ounces) each before dipping and baking. Finished weight will differ.

Dough

Use the weights for this formula. Starter volume changes with aeration, and syrup, sugar, and salt do not all have interchangeable tablespoon weights.

Bath (choose one)

Option A — Food-grade lye bath:

This is 4% sodium hydroxide by total solution weight: 40g divided by 1,000g. It is not the same definition as 40g per liter of water. Read the handling section before preparing it.

Option B — Ordinary baking soda bath:

Option C — Baked baking soda bath: Use 40g of the cooled baked powder in 2,000g water. To prepare the powder, spread 200g food-grade baking soda in a thin layer on a rimmed baking sheet and bake at 250°F (121°C) for about 60 minutes, then cool before handling. Weigh the 40g after baking. Heating drives off water and carbon dioxide, producing sodium carbonate; the extent of conversion depends on heating conditions. Andrea Slonecker’s published method describes this preparation. Store surplus cooled powder in a tightly closed, clearly labeled container, separate from ordinary baking soda, and follow the handling precautions above.

Topping

• Pretzel salt or coarse flake salt: have about 30g available, but sprinkle to taste rather than using it all automatically
• Everything-bagel mix, sesame, or poppy as alternatives

Method

Step 1 — Mix the dough. In a stand mixer with dough hook, combine 500 g flour, 150 g discard, 240 g water, 10 g salt, 5 g yeast, 30 g butter, and 15 g malt syrup. Mix until combined, then knead until smooth and elastic, using about 8-10 minutes total as a starting estimate. Follow your mixer manufacturer’s dough speed and capacity instructions. A small piece should stretch into a thin membrane, though this stiff dough may need a brief rest before testing. The dough will feel stiff; that is correct. If you are new to gauging dough development, our guide to kneading bread covers the windowpane check.

Step 2 — Bulk ferment. Transfer to a lightly oiled bowl, cover, and rest at 75 to 78 F for 60 to 90 minutes. The dough should grow 50 to 75 percent. Use that expansion as the target rather than waiting for a fixed deadline; starter condition and dough temperature affect the rise.

Step 3 — Divide and pre-shape. Turn onto a clean (unfloured) counter. Divide into 8 pieces of about 119g each. Roll each into a tight ball, cover with a towel, and rest 10 minutes. The rest relaxes the gluten so you can roll long ropes without snap-back.

Step 4 — Roll ropes. Roll each ball into a rope 22 to 24 inches long. The rope should taper slightly at the ends and be slightly thicker in the middle. If it snaps back, rest it 5 more minutes. Do not flour the counter — a little friction helps the rope stretch.

Step 5 — Shape the pretzel. Form a U with the rope, cross the ends into a twist, and fold the twist down onto the belly of the U. Press gently to seal. Classic pretzel shape. Place on lightly greased parchment-lined trays.

Step 6 — Cold rest. Refrigerate uncovered for about 30 minutes to firm the shaped dough and dry the surface slightly. Longer refrigeration is optional: keep the dough at 40°F (4°C) or below, cover once it has dried slightly, and monitor proofing. An overnight rest is not automatically better; excessive expansion or a thick dried skin can impair the result.

Step 7 — Heat oven and prep bath. Preheat to 450°F (232°C) with a rack near the center. Prepare the bath:

For lye: Follow the full protective procedure above. Put 960g cold water in the compatible stainless-steel bowl, slowly add 40g food-grade lye, and stir carefully until completely dissolved. Dissolution releases heat; let the bath return to room temperature rather than relying on a fixed five-minute wait.

For ordinary or baked baking soda: Use a wide pot with ample headroom. Dissolve the chosen amount—60g ordinary baking soda or 40g baked powder—in 2,000g water, then bring to a gentle simmer. Use the handling precautions for the chosen powder and avoid steam and splashes.

Step 8 — Dip. Work one pretzel at a time with a wide slotted utensil. For lye, use a brief 10-15 second dip, consistent with the linked King Arthur method. For this formula’s ordinary soda bath, allow about 20-25 seconds; for baked soda, about 15-20 seconds. These are total contact times, turning to wet both sides. Lift, drain thoroughly, and place on fresh lightly greased parchment rated for 450°F. Keep pooled lye off the baking surface; continue wearing protection when handling dipped, unbaked dough.

Step 9 — Slash and salt. With a sharp blade or razor, cut a 3 to 4 inch slash across the belly (the thick bottom curve) of each pretzel. Sprinkle with coarse pretzel salt while the surface is still tacky so it sticks — regular table salt dissolves too quickly; you need large crystals that stay visible on the crust.

Step 10 — Bake. Bake at 450°F (232°C), starting checks at about 12 minutes. The 12-15 minute allowance is an estimate; make sure the thick center is set and cooked through. Lye-treated pretzels generally brown more intensely than baking-soda pretzels. Shield thin arms if they darken before the center finishes, and allow more time as needed.

Step 11 — Cool on a rack. Transfer to a rack and allow to cool until comfortably warm before eating. They are best fresh; moisture migration and salt can change the crust texture during storage.

Doneness cues: an appropriately browned crust for the chosen bath, a set exterior, and no gummy raw dough in the thick center. Surface darkness alone does not establish doneness.

Notes and Variations

Dunk time matters, but it is method-specific. Follow the chosen bath above. There is no universal contact-time boundary that guarantees color or turns every pretzel leathery. Different concentrations and temperatures require different procedures.

Everything pretzels. Use everything-bagel seasoning in place of pretzel salt, adjusting for the salt already in the blend.

Pretzel bites or rolls. Shape changes the baking time and the ratio of crust to center. Use the same appropriate bath procedure, but begin checking small bites earlier and allow thick rolls longer. A separate tested recipe for the shape is a better guide than assuming one time fits every piece.

Discard age. Use recently collected, properly refrigerated discard from an established starter. A calendar cutoff does not override signs of spoilage or poor storage. If the flavor is too sharp, choose fresher discard rather than reducing its amount without replacing the lost flour and water. Do not try to rescue spoiled discard by using less or by baking it.

Storage. Eat plain pretzels fresh when possible, or cool completely and freeze airtight. About 2 months is a quality target for freezing. A 350°F (177°C) oven can refresh them: start checking after about 5 minutes from room temperature or 10 minutes from frozen, and allow longer if necessary. Store unsalted when convenient and add toppings after reheating to reduce surface moisture problems.

Allow about 3 hours for the same-day version. The estimate assumes the shorter cold rest and timely dough development. Preparing baked soda adds a separate heating step, which can overlap with fermentation; an overnight rest makes the total schedule longer.

For a straightforward yeasted take without discard, see our classic soft pretzels recipe. For more starter ideas, see our sourdough discard recipes roundup. If you are still building the starter that produces this discard, our how to make sourdough starter guide explains how to recognize an established culture.