Sourdough discard crackers - you will never throw away discard again!

For any commercial kitchen managing an active bread programme, sourdough discard represents both a culinary shame and a hit to the food cost percentage. In this video, The London Chef presents a straightforward, zero-waste solution to turn this by-product into a premium, high-margin larder offering: crispy, seeded sourdough discard crackers. This formula is ideal for serving alongside cheese boards, charcuterie, or as an upscale amuse-bouche.

The Chemistry of Gluten Degradation

Rather than using fresh discard immediately, the key technique highlighted is the consolidation of discard over several days. By storing daily discard in a single container in the fridge, the older discard effectively "feeds" on the new additions. More importantly, this extended resting time allows the acidity to break down the gluten structure completely. In pastry work, gluten development is prized, but for a delicate cracker, we want the opposite. Eliminating gluten elasticity prevents the batter from shrinking back when spread, allowing chefs to achieve an incredibly thin, even layer that bakes to a uniform, shatter-crisp texture.

Preparation and Baking Execution

The baker mixes 240g of sourdough discard with 60g of bread flour, 4g of salt, and 40g of water. This creates a highly spreadable paste rather than a traditional rolled dough. Using a spatula, the mixture is spread directly onto a non-stick silicone baking mat. A generous scatter of mixed seeds—including linseeds, sunflower seeds, cracker rye, onion seeds, and oats—is pressed into the surface to add texture, colour, and earthy flavour profiles.

The crackers are baked at 170°C for a total of 14 minutes. Crucially, the tray must be rotated halfway through the bake to compensate for any oven hot spots. This short bake time dehydrates the thin batter, transforming it into a brittle, golden sheet ready to be snapped into rustic shards for service.