Step 1

Place the heavy cream, grain mustard, and butter in a sauce pan over medium heat.

Step 2

Then add the salt and black pepper.

Step 3

Use a whisk to combine the ingredients, then turn the heat down to medium-low heat and let the sauce simmer for a few minutes to thicken.

Step 4

Continue to stir the sauce until it's nice and thick, remove the pan from the heat.

Step 5

Pour it into a sauce jug ready for serving.