TO MAKE MUSTARD

This mustard can be made up to 2 weeks ahead. The flavor will mellow and develop over the first 24-48 hours. Store in a clean glass jar with a tight-fitting lid in the refrigerator.

Store in an airtight glass container in the refrigerator for up to 2 weeks. The mustard may thicken as it sits; thin with a small amount of vinegar if needed. Do not store at room temperature due to the butter content, which can spoil.