Brazilian-Style Stroganoff (Estrogonofe) - Chopped

Ingredients

• 1 lb beef sirloin thinly sliced
• 1 medium onion chopped
• 8 oz mushrooms sliced
• 2 Tbsp butter
• 2 Tbsp ketchup
• 1 cup beef broth
• 1 cup heavy cream
• 1 Tbsp mustard
• 4 cups cooked white rice
• 1 cup shoestring potatoes for garnish