Lemons and
limes are interchangeable in most recipes, but lime has a more aromatic
intense flavor. Grapefruit may have green, yellow or pink-flushed skin,
with yellow, green or pink flesh.
Kumquats are
tiny relatives of oranges and can be eaten whole, either raw or cooked.
Oranges, satsumas, tangerines, clementines and numerous other small
varieties of citrus fruits are virtually interchangeable.