10  ounces  fresh spinach – washed and chopped
10  whole fresh mushrooms – sliced
4  hard-boiled eggs – chopped
6  slices  bacon – cooked and crumbled
1  cup olive oil
1/4  cup sour cream
1/4  cup red wine vinegar
1/2  teaspoon  dry mustard
1  tablespoon  sugar
1/2  tablespoon  salt
1/4  teaspoon  black pepper

Toss spinach, mushrooms, chopped egg, and crumbled bacon.
Whisk remaining ingredients together.
Toss with vegetables to coat spinach.