Here is a website that sells seeds and gives various ways how to grow them. The recipes are somewhat bizarre, but exemplify their enthusiasm.
It is easy and fun to grow your own sprouts. No dirt required. Here it is in a nutshell. Growing a new batch every other week or so has been a lot of fun.
All you do is take a 1 quart mayo jar, place 2 Tbsp seeds* inside, cover with water and let soak an hour. Place a piece of nylon screen or cheesecloth, about 4" square, over the mouth of the jar, and secure tightly with a wide rubber band. Drain water out of jar. Turn jar upside down and tilt slightly so air can circulate, and place, tilted, in a shallow dish. (I use a 2" deep rectangular plastic Rubbermaid container.) Now put everything in a well-ventilated area away from direct sunlight. Rinse sprouts morning and evening, and clean drainage from bottom of dish. After a week, pull sprouts from jar, place in a large bowl , and cover sprouts with water. Gently shake sprouts under water, separating them gently with your hand so that hulls rise to top. Some sink to the bottom. Rinse off all hulls the best you can, drain well and store covered in fridge. Use within 4-5 days before they wilt.
We like a little sandwich with our sprouts...very delicious. Eat enough of them and you begin to smell like chlorophyll. No fooling.
*You can buy seeds at Whole Foods or Country Sun. I suggest a mix of alfalfa, fenugreek, broccoli, onion and/or lentil. Broccoli sprouts have the highest antioxidant levels. Broccoli seeds and onion run about thirty bucks a pound.