Ingredients for tomorrow's cake

Hoping to get around to baking a lemon and poppy seed cake tomorrow.

Holmes and Watson were chasing the villain through the streets. As they rounded the corner they were faced with an empty street, the villain was nowhere to be seen. Holmes looked around, then pointed to a yellow door.

"He's in there " he said

" How do you know? " asked Watson

"A lemon entry " replied Holmes

bdum tissssssssssssh!