In Agatha Christie's \"The Body in the Library\", what dish does Miss Marple prepare for the guests?

In Rex Stout's \"The Doorbell Rang\", what food item does Nero Wolfe use to trap a murderer?

In Arthur Conan Doyle's \"The Adventure of the Speckled Band\", what poisonous plant does Dr. Grimesby Roylott use to kill his stepdaughter?

In Patricia Wentworth's \"The Case of the Silent Partner\", what food item does Miss Silver use to determine the identity of a murderer?

In Ngaio Marsh's \"Death in a White Tie\", what food item does Roderick Alleyn use to solve a murder mystery?

In Dorothy L. Sayers' \"The Nine Tailors\", what food item does Lord Peter Wimsey use to uncover a hidden message?

In Elizabeth George's \"For the Sake of Elena\", what food item does Inspector Lynley use to track down a serial killer?

In Joanne Fluke's \"Chocolate Chip Cookie Murder\", what food item does Hannah Swensen use to solve a murder mystery?

In Alexander McCall Smith's \"The No. 1 Ladies' Detective Agency\", what food item does Precious Ramotswe use to comfort her clients?

In Donna Leon's \"Death at La Fenice\", what food item does Commissario Brunetti use to investigate a murder at the opera house?

In Ruth Rendell's \"The Veiled One\", what food item does Inspector Wexford use to solve a murder mystery?

In P.D. James' \"Death Comes to Pemberley\", what food item does Superintendent Adam Dalgliesh use to uncover a hidden secret?

In Ian Rankin's \"The Hanging Garden\", what food item does Inspector Rebus use to track down a serial killer?

In Val McDermid's \"The Distant Echo\", what food item does Karen Pirie use to solve a cold case murder?

In Ann Cleeves' \"Raven Black\", what food item does Vera Stanhope use to uncover a hidden clue?