1. Slice the turkey into 1/2 inch strips. Drain the asparagus. Wash and stem the spinach and chop coarsely.
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2. Chop the eggs and onion. Slice the tomatoes, if used.
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3. Prepare the dressing by placing the mustard in a bowl. Gradually whisk in the water until it is thoroughly incorporated. Slowly beat in the oil. Add the vinegar and beat until well combined.
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4. When ready to serve, toss all the salad ingredients together in a bowl. Pour on the dressing and serve.