Pajurá (Couepia bracteosa) is a "crazy" fruit that very few people know about and few like. I happen to love it, which explains why only the seed is left. As you can see, I broke the shell around it so that it will germinate faster. It looks a bit like an avocado seed, but I assure you that the fruit is quite different. On another occasion, I'll take a picture of the edible part.