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Cut the beef tenderloin into bite-sized pieces.
Wash and slice the onion, carrot, and celery.
Heat olive oil in a pot and sautรฉ the tenderloin.
Add the vegetables and stir-fry together.
Add water and tomatoes, then bring to a boil.
Season with salt and pepper to taste.
Simmer over medium-low heat until the ingredients are cooked through.
Serve on a plate.
