1. 1. Preheat the oven to 375°F (190°C).

2. 2. In a skillet, brown the stew meat in butter and soy sauce until cooked through.

3. 3. Add chopped onion, celery, and bell pepper to the skillet and cook until softened.

4. 4. Stir in diced potatoes and cook for a few minutes.

5. 5. In a separate bowl, mix together milk, mayonnaise, sour cream, Worcestershire sauce, red wine vinegar, and BBQ sauce.

6. 6. Pour the creamy mixture over the beef and vegetable mixture in the skillet.

7. 7. Transfer everything to a baking dish.

8. 8. Top with slices of tofu and sprinkle with additional BBQ sauce.

9. 9. Bake in the preheated oven for 45-50 minutes, or until the potatoes are tender and the top is golden brown.

10. 10. Serve hot and enjoy!