Equipment
Ingredients
Mustard Base
- 50 g yellow mustard seeds
- 50 g black or brown mustard seeds
- 120 ml dry red wine
- 60 ml red wine vinegar
Grape Reduction
- 150 g seedless black grapes, washed and stemmed
- 20 g brown sugar, packed
- 6 g kosher salt
- 30 ml water
Nutrition (per serving)
Nutrition is estimated per serving. Nutrients without complete source data are omitted.
Full nutrition
- Calories
- 25 kcal
- Protein
- 1 g
- Carbohydrates
- 3 g
- Fat
- 1 g
- Fiber
- 1 g
- Sugar
- 1 g
- Sodium
- 78 mg
- Saturated Fat
- 0 g
- Potassium
- 40 mg
- Calcium
- 2 mg
- Iron
- 0.1 mg
- Magnesium
- 1 mg
- Phosphorus
- 2 mg
- Zinc
- 0.0 mg
- Vitamin A
- 0 mcg
- Vitamin C
- 0 mg
- Vitamin E
- 0.0 mg
- Vitamin K
- 1 mcg
- Vitamin B6
- 0.0 mg
- Riboflavin
- 0.01 mg
- Niacin
- 0.0 mg
- Folate
- 0 mcg
- Water
- 10 g
- Alcohol
- 0 g
Sources: Aggregated Public Data, USDA FoodData Central
Method
Combine the yellow mustard seeds, black mustard seeds, dry red wine, and red wine vinegar in a glass or ceramic bowl. Cover tightly and leave at room temperature to soak for exactly 24 hours.
In a small saucepan, combine the seedless black grapes, brown sugar, and water. Bring to a gentle simmer around 90°C/195°F over medium heat until the grapes burst and release their juices, about 15 minutes.
Pour the hot grape mixture through a fine mesh strainer set over a clean bowl. Press firmly on the grape solids with the back of a spoon to extract as much liquid as possible. Discard the skins and allow the resulting syrup to cool completely to room temperature.
Transfer the soaked mustard seeds along with any unabsorbed wine liquid to a food processor. Add the cooled grape syrup and kosher salt.
Pulse the mixture until the desired consistency is reached. For a rustic coarse texture, process for about 2 minutes, leaving some seeds partially intact while forming a thick paste.
Transfer the fresh mustard to a glass jar with a lid. Refrigerate for at least 24 hours before serving to allow the intensely bitter raw mustard compounds to mellow and the flavors to harmonize.
Chef's Notes
- Heat destroys the pungent myrosinase enzyme in mustard. Always ensure your grape reduction is fully cooled before blending with the seeds to retain the mustard's characteristic kick.
- The type of wine significantly impacts the final flavor profile. A fruit-forward, dry red like Pinot Noir or Syrah pairs beautifully with the fresh grapes without introducing excessive tannins.
- If you prefer a completely smooth mustard, use a high-powered blender instead of a food processor and blend for 4 to 5 minutes, adding a tablespoon of water if it gets too thick to circulate.
- Mustard acts as a natural thickener. It will continue to thicken slightly as it sits in the refrigerator. Adjust with small amounts of water or vinegar if needed right before serving.
Storage
Refrigerator: 3 months — Mustard will continue to mellow and flavors will meld significantly over the first 2 weeks.
Troubleshooting
Mustard is overwhelmingly bitter and pungent
Cause: The myrosinase enzyme reaction has not had enough time to degrade the bitter sinigrin compounds
Fix: Wait an additional 2 to 3 days; the bitterness will naturally dissipate into a pleasant tang
Prevention: Ensure proper aging time in the refrigerator before consuming
Mustard is too thick and paste-like after blending
Cause: Mustard seeds absorbed more liquid than expected during the soak
Fix: Stir in a few drops of red wine vinegar or water until the desired spreadable consistency is reached
Prevention: Measure seeds carefully by weight rather than volume
Mustard tastes metallic
Cause: Seeds were soaked in a reactive metal bowl, reacting with the vinegar
Fix: Cannot be fixed
Prevention: Always use glass, ceramic, or non-reactive plastic when marinating with acidic ingredients
Cultural Context
This style of condiment is directly inspired by Moutarde Violette de Brive, a historic 14th-century French mustard traditionally made with fresh grape must from the Bordeaux region. The addition of reduced fresh grapes and red wine provides a striking purple hue and a complex sweet-tart profile that cuts through the richness of cured meats, making it an exceptional addition to summer charcuterie.
