Steam cooking is a great way to cook vegetables, which retains most of the nutrients, color and texture of vegetables.
A simple vegetable steamer can do the trick.
To learn more, see my article in the online magazine Suite101 -Vegetable Steamer for Healthy Cooking
Visit the Steam Cooking Store for USA or
Checkout the Vegetable Steaming Shop for UK
In India, I found Vinod Steamer is good, but not widely available.