Spinach Strawberry Salad

2 bunches spinach
1/2 pound bacon
Feta cheese crumbles
1/4 red onion diced
Strawberries sliced

3/4 T poppyseeds
1/3 cup white vinegar
3/4 cup oil
1/3 cup sugar
3/4 T grated onion
1/3 t prepared mustard
3/4 t salt