Ingredients

3 tablespoons red-wine vinegar

1 tablespoon olive oil

Coarse salt and ground pepper

5 ounces baby spinach (about 5 cups)

8 ounces white button mushrooms, stems trimmed, thinly sliced

1 small red onion, thinly sliced

1/2 red bell pepper, ribs and seeds removed, diced

2 ounces crumbled blue cheese (scant 1/2 cup)

Preparation

In a large bowl, whisk together vinegar and oil; season with salt and pepper.

Add spinach, mushrooms, onion, bell pepper, and blue cheese to bowl; toss to coat with dressing. Serve immediately.