The Krusty Krab appears to have a salad bar. In this particular episode, Mr. Krabs makes the salad bar free after having a very long loss of customers.
SpongeBob is ordered to make two salads. Pearl makes one by removing everything from two Krabby Patties except the tomato and lettuce. This shocks SpongeBob, who has apparently never seen a salad before. Even though he is brokenhearted after destroying a couple of Krabby Patties, he sadly brings them to the customers (to the point of tears). They appear to be sad too.
Salad reappears a cookable food in the Krusty Krab, where it has the same appearance as its "Bossy Boots" form. It needs one head of lettuce and one tomato in order to be made. It takes 45 seconds to create, gives 7 happiness when collected from the Krusty Krab, and gives 13 coins when fed to a Bikini Bottomite.
Ironically, a side salad is usually seen on the menu, indicating that SpongeBob does know how to make a salad.
This also means that customers do not order salads from the Krusty Krab.
SpongeBob calls the salads "sa-lads" as a running gag in the episode "Bossy Boots."