What are Quenepas?

In the semi-finals of Top Chef Wisconsin ™ we saw Chef Danny out shopping in the Curacao markets and finding 'quenepas' which we heard he had eaten as a child.

Quenepa, also known as Spanish lime, mamoncillo, or limoncillo, is a tropical fruit native to the Caribbean, Central America, and parts of South America. It is a small, green fruit with a thin, leathery skin and a tart, juicy pulp surrounding a large seed. It isn't so tart that it is inedible and children often suck the juice and pulp, but it needs careful balancing in cooking.