Green vegetable.
The item id for Lettuce in unturned is 338. You can use this ID with the commands below to spawn the item, give it to a player or buy it on a modded economy server.
Useable: Consumeable
Size_X: 1
Size_Y: 1
Size_Z: 0.25
Quality_Max: 50
Food: 15
Water: 15
Actions: 1
Action_0_Type: Blueprint
Action_0_Source: 339
Action_0_Blueprints: 1
Action_0_Blueprint_0_Index: 0
Action_0_Key: Craft_Seed
ConsumeAudioClip: Sounds/EatCrunchy.mp3