Grainy Sherry Mustard

Store-bought mustard can’t touch what happens when you make your own from whole seeds. This grainy sherry mustard blends coarsely pureed mustard seeds with dry mustard powder, then cooks them with sherry and sherry vinegar into a thick, speckled condiment with real bite and complexity.

The two-hour rest after blending the seeds with water is doing essential chemistry. Raw mustard seeds are intensely bitter and harsh. That resting period allows enzymes to break down and the flavor to develop from aggressively sharp into something warmer and more rounded. Skip this step and you’ll get a mustard that’s all heat and no flavor.

Cooking the mixture in a double boiler for 10 minutes thickens it gently without scorching. Direct heat would cook too fast and kill the volatile compounds that give mustard its character. The double boiler’s gentle warmth sets the consistency while preserving the layered sherry-vinegar tang.

Corn syrup stirred in at the end adds a smooth sweetness that balances the acidity and heat without masking them. The overnight refrigeration mellows everything further, and the flavor continues to develop over days.

Chef Tips

• Don’t skip the 2-hour rest after blending. It’s not optional. The mustard needs that time for the flavor to develop properly
• Use real sherry and sherry vinegar, not cooking sherry. Cooking sherry has added salt and a flat, tinny flavor
• The mustard will seem thin when warm. It thickens considerably as it chills overnight
• This keeps for a month in the fridge. The flavor peaks around day 3 and stays strong throughout

Variations

• Honey mustard: Replace corn syrup with an equal amount of honey for a more floral sweetness
• Herb-spiked: Stir in a tablespoon of chopped fresh tarragon or dill after cooking for an herbed mustard
• Whole grain only: Skip the dry mustard powder entirely and double the mustard seeds for a chunkier, milder result