This is a new mesh, and means that it's a brand new self contained object that usually does not require a specific Expansion pack (although this is possible depending on the type). It may have Recolours hosted on MTS - check below the description for more information.
A harvestable lettuce plant.
Update 2016-01-28: Bugfix -- Harvestable states put in the correct order, so now the plant wil be harvestable when it has reached its biggest state (and not become harvestable and then unharvestable again). Thanks to Onyeka001 and KD9B for testing!
Update 2016-01-25: Updated with Harvest interactions for children. They use the standard "Swipe to Inventory" animation (which is pretty much the same as the Harvest one, only with a different sound and no prop). Update 2016-01-24 II: Portuguese, Spanish, and Italian added. Update 2016-01-24: Updated with added Chinese, Dutch, French and Russian strings. Thank you for posting them!
It has three growth states and works like any other garden plant, except that it has a custom harvesting interaction: instead of growing fruits that are removed, the whole plant is harvested when it has reached maturity (takes about as long as the spinach); the sim gets six harvestables in return, and the plant it is reset to its sprout state. This is because if I’d use the actual harvestables as leaves, the majority of the plant would be the harvestables, and since those do not have a dry state one wouldn't be able too see when the plant falls dry. (It has a dry state too btw, I just haven't yet managed to make a screenshot of that).
Note that the leaves that are harvested currently know nothing about the plant they come from; they will always be "Normal".
The harvestable leaves can be eaten raw or used for any recipe that requires vegetables. I have also added recipes for Garden Salad and BLT to More Logical Cooking that require lettuce as an ingredient.
To get a lettuce plant or leaves, use debug mode and search for "lettuce" (see stickies in Discussion > Help if you don’t know how the cheats work) or Buy Ingredients from Fridge (graycurse).
For those interested in how custom harvestables work, I posted an overview in Create > Tutorials.
US English, Traditional Chinese (wuccwzt), Dutch (ElenaInTheSims), French (MiniMimi), German (pbox), Italian (Eámanë), Portuguese (simshout), Spanish (gato_24), Russian (igor97). More contributions welcome! See this tutorial on translating mods if you aren’t sure how that works.