What you do: Wrap the whole fruit in tinfoil and set it on the baking sheet. Pop it in the oven at 200 degrees fahrenheit for ten minutes, or until the avocado is soft (depending on how hard it is, it could take up to an hour to soften). Remove it from the oven, then put your soft, ripe avocado into the fridge until it cools. #cookingtips &hacks Source by urdetermined