When the ribs are stewed, tender sweet corn is put inside. The taste of tender corn is relatively sweeter and softer than that of old corn. The old corn starch content is high and the corn flavor is strong, but the texture is not as good. The grains are uniform. Try to choose corn with small grains. The leaves are tender green and the corn is relatively soft when pinched. It is fresh and tender corn. Real sweet corn is bright yellow corn with neat grains and a smooth and flat surface. Ordinary yellow corn has irregular grains and uneven grains.