Halloween Sour
Cinnamon stick or ground cinnamon + nutmeg
Note: Should be 1 tbsp of pumpkin butter.

Add all ingredients to shaker and shake for 20 seconds to emulsify the egg. Add ice to shaker and shake again to cool. Double strain (if you're fancy) into a martini glass.
[['1 fresh', 'Egg white'], ['1 spoon', 'Pumpkin butter'], ['6 cl', 'Bombay Sapphire Gin'], ['1.5 cl', 'Lemon juice (freshly squeezed)']]
[['1 fresh', 'egg white'], ['1 spoon', 'pumpkin butter'], ['6 cl', 'gin'], ['1.5 cl', 'lemon juice']]