Gem lettuce, also known as Little Gem Lettuce and Baby Gems Lettuce, is a miniature variety of Romaine lettuce. It is like a mix of Romaine lettuce and butter lettuce in texture and flavor. You can find it in the produce section of your grocery store, and it looks like a tiny version of Romaine lettuce. It's sweet like butter lettuce but crisp like Romaine, and so delicious!