We grow a variety of hydroponic lettuce from Spring to Fall, and give it to you while it's still living. Can't get fresher than that.
Container of Water (recommended)
Keep living lettuce in a container filled with water so that only the bottom of the roots are submerged in the water. Add and replace water as needed. Tear leaves off stem and wash before eating. Best kept for less than a week.
Tear leaves from root, wash, and place in a container with a damp paper towel in the fridge. Best kept for less than a week.