Immature legume pods and green seed are used as vegetables. Green pods contain good quantities of fiber and most nutrients, especially protein, vitamins and minerals, but little oils and carbohydrates. Immature seed contains similar nutrients to mature seed but are higher in vitamins A and C and are easier to digest. A few leguminous vegetables contain toxic substances. All should be well cooked before eating. They can be adequately prepared by boiling 20 minutes.