Poppy Seed Dressing

I like to use this to dress a salad of spinach, mandarin orange segments, almonds, mushrooms, crumbled bacon, and shredded Swiss cheese.

In a blender, thoroughly combine the following:

1 1/2 cups sugar
2 TBSP dry mustard
2 tsp salt
2/3 cup white vinegar
3 TBSP fine onion juice (I've not been able to find this yet, so I usually liquefy a chunk of onion before adding the rest of the things to my blender.)
Slowly add
2 cups salad oil and blend for 5 minutes to emulsify.
Add 3 TBSP poppy seeds to mixture and blend just to combine.