The fruit is known for its loose and bumpy skin. Unripe, yuzu is green but turns to a bright yellow (similar to lemon) as it ripens. The inside flesh is also similar to a lemon, with many seeds.
You can also visibly note the difference in flavor and ingredients just by observing the appearance of the sauces: Ponzu is much darker than the yellow- or green-tinged yuzu sauce. Read the ...