Place mayonnaise, mustard, worcestershire saucegarlic, sugar and pepper in a blender or food processor.
Start at a low speed and graduate up to a higher speed. You may need to turn off the blender once or twice and press out air the bubbles with a spatula toget it all blended well.
Transfer the mix to a bowl.
Stir in the 1 teaspoon of mustard seed. Put in a covered container and store in refrigerator overnight, to let flavors marry.
After 24 hours, the spread is ready to use. Use as spread or dip for sandwiches. Enjoy!