When a sandwich does not contain meat and thus is not a sandwich. Peanut Butter and Jelly and Grilled Cheese do fall under the category of sandwich and are the only exceptions. This is because 1. Peanuts can be considered a meat, and 2.Grilled Cheese does not traditionally contain vegetables. Besides these two examples, a meatless sandwich is considered salad on bread. This is oft a hotly debated topic
Why didn't you get a real sandwich? That looks like salad on bread!