
This mustard sauce is a must have when you're serving ham! Easy to make, it keeps for a long time, and it's perfect as a dipping sauce or on a sandwich!
In a small saucepan (not an iron pan!), whisk the egg yolks until they are smooth and have lightened a bit in colour.
Add the sugar, dry mustard and vinegar and whisk together until smooth and well combined.
Bring the mixture to a boil over medium heat, whisking constantly.
Lower the heat and simmer, whisking constantly, until the sauce thickens slightly.
Remove the pan from the heat.
Serve the mustard sauce either hot or cold. Store it in an airtight container in the refrigerator.