A thin skinned avocado that turns black when ripe, has the most flesh to seed/skin ratio of any commercial avocado.   83% of what you buy is edible compared to just 72% for a hass. Known for their small seed and the fact that they take several days to oxidize after cooking, the Sir Prize avocado has a nutty taste that is great in guacamole or just sprinkled with a bit of salt and lemon.   Availabe Nov-March.