Instructions: In medium bowl stir together all dressing ingredients; set aside.

Spray 10- to 12-inch nonstick skillet with vegetable cooking spray, add beef and onions. Cook over medium heat, stirring occasionally, until onions begin to soften and beef is hot (about 2 to 3 minutes).

In a large bowl toss together beef mixture, tomatoes, spinach, and dressing. If desired, serve with croutons or garlic toast.

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