Chicken hearts (available at your local butchers) are marinated, skewered and cooked on the barbecue. This typical Brazilian barbecue dish is found in restaurants throughout the country.
Also called achiote powder, it can be found at Asian or Latin American shops and markets, or online. Annatto is mostly used for the vibrant colour it imparts, so in a pinch you could either omit it from the recipe or use equal parts paprika and turmeric instead.