The acronym "BLTS" likely refers to the phrase "Bacon, Lettuce, and Tomato Sandwich." The clue "Initial orders at a diner" suggests that the letters "BLTS" are the initials of a food item commonly ordered at a diner, which in this case, is a BLT sandwich. A BLT sandwich typically consists of crispy bacon, lettuce, sliced tomatoes, and mayonnaise, served between two slices of bread.
Note: The provided meaning of the answer is for the latest New York Times crossword puzzle clue: Crispy sammies. Explanations are generated by AI and may be inaccurate.