As you sit and wait for all those trick or treaters on Halloween night, here's a terrifying drink to sip, right out of a Sherlock Holmes story!
First you need to color the salt. In a small bowl, mix the salt with the food coloring until it's well mixed. Spread it out on a piece of parchment paper and dry it in a 250° oven for about 30 minutes. Remove from the oven and allow to cool. Store in a small jar.
To make the drink, wet the rim of the glass with some lemon. Place the salt in a deep plate and roll the glass rim in it. Set it aside.
Next, in a pitcher, mix the grapefruit juice, vodka and food coloring, stirring until well blended.
Add ice cubes to the glasses and pour the drink in. Sit back and enjoy the Halloween evening!