Spinach Salad with Poppy Seed Dressing

I came across this wonderful recipe the other day on another food bloggers site and knew I needed to try it,I then made a few alterations( because of my own likes and dislikes :) ) and it became one of my new favorites!
Spinach Salad with Poppy Seed Dressing
2 (6 oz) bags of Spinach
1 lb. Bacon,fried and crumbled
1 Red Onion,sliced
8 Mozzarella String cheese,sliced
Wash Spinach place in bowl add onion.Cover and refrigerate at least an hour (to marinate) then place in serving bowl and add bacon and cheese.
Poppy Seed Dressing
1 1/2 T Poppy Seed
1 cup Oil
3/4 cup Vinegar
3/4 cup Sugar ( next time I'm going  add just 1/2 cup)
3/4 tsp Salt
3/4 tsp dry mustard
Combine all the dressing ingredients shake well,drizzle on salad. Delicious!

Original recipe adapted by: Mandy's Recipe Box