Puree the tomatoes, celery and broth in a blender until smooth. Season, to taste, with salt and pepper. Season with lemon juice and maple syrup. Stir in cream.
Transfer to a microwave safe bowl. Heat in microwave on HIGH until warmed through, about 4 minutes. (Alternatively, heat the old-fashioned way in a pan.) Pour hot soup into an air-tight thermos. Pack in a lunch sack and send off to school.
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