Stilton Dressing

1/3 cup chicken broth
1 tablespoon finely chopped onion
yolk from 1 hard-boiled large egg
2 teaspoons powdered mustard
1/2 teaspoon salt
1/4 teaspoon black pepper
1/8 teaspoon Worcestershire sauce
1/3 cup distilled white vinegar
1 cup vegetable oil
4 ounces Stilton cheese

In a small saucepan bring broth to a boil and add onion.
Remove pan from heat and steep mixture 10 minutes.
Pour liquid through a sieve into a blender and discard onion.
Add yolk, mustard, salt, pepper, Worcestershire sauce, and vinegar and blend until smooth.
With motor running, add oil in a slow stream, blending until emulsified.
Crumble Stilton.
With motor off add Stilton, and blend until very smooth.
Pour dressing through a sieve into a bowl.
Dressing keeps, covered and chilled, 1 week.