Spicy Whole-Grain Pub Mustard

Ingredients

• 50 g yellow mustard seeds
• 50 g brown mustard seeds
• 180 ml German Doppelbock beer or similar
• 60 ml apple cider vinegar
• 2 tbsp honey
• 2 tbsp dark brown sugar
• 2 garlic cloves, smashed
• 1 bay leaf
• 2 tsp kosher or fine sea salt
• 1/8 tsp ground black pepper

Method

Soak the yellow and brown mustard seeds in 120 ml of the beer for 24 hours in the fridge, keeping them submerged. This hydration swells the seeds and softens their outer hull, making them easier to grind whilst preserving the whole-grain texture you're after.

Combine the remaining 60 ml beer with the vinegar, honey, brown sugar, smashed garlic, bay leaf, salt, and pepper in a small saucepan. Bring to a rolling boil over medium-high heat, stirring to dissolve the honey and sugar fully — about 2 minutes. Once the sugar has disappeared into the liquid, kill the heat. This brief boil drives off some of the beer's alcohol and mellows the vinegar's sharpness without cooking it to bitterness. Cool to room temperature; the residual heat will continue the process gently. Fish out the garlic and bay leaf.

Pour the cooled liquid into a blender with the drained mustard seeds. Blend on medium speed for 15–20 seconds first, stopping to check the grind: you want roughly half the seeds split open and ground into a paste, the other half still whole. This mustard-making balance — part texture, part bite — is what separates pub mustard from smooth ballpark versions. If you over-blend, you lose the grain and end up with a uniform slurry. Blend again in short 5-second bursts until the mixture thickens to the consistency of rough porridge; the natural oils and pectin released from the damaged seeds do the thickening work here.

Transfer to an airtight jar and refrigerate. The flavours deepen considerably over time — eat it at 3 days if you're impatient, but a week is better. At 3 weeks, the condiment reaches peak complexity as the seed oils fully integrate and the vinegar's edge softens. The fermented-condiments parallel is real: even without added cultures, the acidic environment preserves and slowly develops the profile. If the mustard tightens too much after a few weeks — it will, slightly — stir in a teaspoon of beer or vinegar to loosen it. This keeps indefinitely once jarred and chilled.