Good-Cooking - Cajun Style Tip Roast

Ingredients

• 1 (4 pound) tip roast
• 1/4 cup finely chopped onions
• 1/4 cup finely chopped celery
• 1/4 cup finely chopped green bell peppers
• 2 tablespoons vegetable oil
• 1 teaspoon salt
• 2 teaspoons pepper
• 1 clove garlic, minced
• 1/2 teaspoon dry mustard
• 1/2 teaspoon cayenne pepper