The pummelo and grapefruit are the largest of citrus fruits. The pummelo can range from 5 to 10 inches in diameter, while the grapefruit is typically 3 to 6 inches in diameter. The pummelo is native to southern Asia and resembles a grapefruit.
The rind of a pummelo is thick and transforms from dark green to yellow as it ripens. There are several known varieties of grapefruit including the most common, red and pink, as well as white and gold flesh tones.
As the grapefruit has more of a bitter, acidic taste, the pummelo has a sweet flavor. Pummelos are typically in season from mid-October to April.