It is a fruit from São Tomé and Príncipe known as safu . It is also found in Nigeria and Angola. In this Portuguese-speaking African country, the fruit is known for mubafo.
Safed it is the tree that produces these fruits that are pink, when they are green and purple or bluish, when they are ripe. O safu to be consumed it must be in its maturation phase, that is, bluish-purple and hard. If it is soft and creamy, it means that it is in its putrefaction phase, unfit to be consumed. O safu you eat boiled or roasted. After cooking it has a soft or creamy texture, depending on the quality of the fruit. I reinforce that the safu when raw, it has to be tough or hard. Only after being cooked does it have another malleable texture. If raw, it is as if it were cooked, it is because it is not in conditions to be consumed, it is best to throw it away.
The safu has an acidic or slightly sweet flavor, depending on the type of fruit. Before cooking, scrape a little with a knife.
For those who lived in São Tomé and Príncipe and those who think about going there, here is the suggestion.