Hi Tubs,
You can sprinkle on savoury sandwiches or add to soups, stews etc.
Try this site for their benefits and side effects : - http://www.pjstory.com/alfalfa.htm
Al-fal-fa is arabic for "Father of all foods!."
Best in salads, they taste a bit like grass. AFAICR they're too mechanically fragile to be worth cooking.
Save a few seeds to plant in the garden, alfalfa (lucerne) is quite pretty and soon becomes established. Where we used to live they turned a field over to alfalfa and took several cuts a year for silage, then when they resowed with other crops alfalfa would still sprout up round the field edges for years.