If you have planted your lettuce to close together, if the lettuce has dried out a lot during the growing season, or if the weather is hot, you could easily end up with dreadfully bitter lettuce. It may look beautiful and lush like mine in the above photo, but it tastes just terrible. I couldn't stand the thought of composting the lettuce, so I went searching for a recipe. Even better than a recipe for bitter lettuce, I received a tip from @tryplasticfree on twitter. They suggested that I cut up the lettuce and soak it in cold water for 10 minutes. Luckily, I forgot and left the lettuce in the water for around 30 minutes. After 30 minutes the lettuce tasted much better, but a day or two later I tried with for only 10 minutes and it was still really very bitter.
Feel free to leave a comment if you have any lettuce growing tips or lettuce recipes.