1 pound of cubed beef tenderloin3 tablespoons of butter1/2 teaspoon of salt1/2 teaspoon of black pepper1/2 teaspoon of paprika1 onion, sliced2. and 1/2 tablespoons of Worcestershire sauce2 small hot red chili peppers, stemmed and chopped (retain the seeds)4 garlic cloves, minced1 tablespoon of flour1/2 cup of beef stock1/2 cup Portuguese red wineSalt and pepper (to taste)4 Portuguese bread rolls, for dipping