Yellow onions is one of the most common variety of onion, characterized by a golden-yellow skin. The onion is white on the inside. Its flesh is firm and has a sharp taste. While, red onions has a bright, smooth, papery purplish-red skin. Its flesh is mostly white with a red tinge to each layer's edges. The red onion has a somewhat milder aroma and is a beautiful red color in its core. The Onions season lasts from March through the end of November