Rachel's Spinach Salad Dressing

I got this recipe from Rachel Williams and it is my all-time favorite dressing.

1/2 c. sugar
1/2 c. vinegar
1 c. of vegetable or canola oil
1 tbsp. poppy seeds
1 tbsp. grated onion (KJ doesn't like onions so I usually skip this)
1 tsp. salt
1 tsp. dried mustard
1 lb. cottage cheese (I have found that the more cottage cheese you put in the thicker the dressing is, so you may just want to slowly add some in until you get your desired consistency.)

Salad ideas:

spinach
purple onion
shredded mozzarella cheese
shredded swiss cheese
stawberries
mandarin oranges
crumbled bacon
grilled chicken