Pomelo

Also known as Chinese grapefruit

pomelo chinese grapefruit

Looks like a huge grapefruit, about 15-25cm in diameter and 1-2kg in weight. Normally pale green to yellow when ripe with sweet white flesh and very thick pith.

Originating from South East Asia; in rural areas of North Eastern India children even sometimes use the fruit as a football. It's widely available in most large supermarkets.