It is called ugli fruit because it is ugly, with odd shapes and pot-marked skin, ranging in size from that of a baseball to giant grapefruit. Its Jamaican origins are unclear, but it is believed to be a cross between a mandarin orange and a Pomelo (the original grapefruit). The ugli fruit's skin is very thick, loosely covering large, juicy, acid-sweet, yellow-orange pulp segments (seed-free).
UGLI is the trademark of Cabel Hall Citrus Limited and under which it sells its Jamaican tangelo, a citrus fruit created by hybridizing a grapefruit (or pomelo), an orange and a tangerine.
Pick fruit that is heavy for its size that gives slightly to pressure. The smaller fruit tends to be more flavorful and sweeter.
Refrigerate up to 3 weeks, or store at room temperature 5 days.