What are the main soybean vegetables? Soybeans (13g/ 100g), soybean sprouts (4.5g/ 100g), black bean sprouts and other vegetables derived from soybeans. In addition, some leguminous vegetables with high starch content, such as pea (7.4g/ 100g) and broad bean (8.8g/ 100g), have high protein content. However, these vegetables have one thing in common, that is, the energy content is relatively high, and eating too much is easy to get fat.