Cocktails. How much is a dash?

[Basil]

Remembering how Mrs. B and I used to enjoy drinking Gloom Raisers at our favourite evening spot when we were bright young things, I've just looked up the recipe.

Ingredients
2 parts Gin
3/4 part Dry Vermouth
2 dashes Pernod
2 dashes Grenadine
Mixing Instruction
Stir with ice. Strain in a cocktail glass. Decorate with a maraschino cherry.

OK, so many parts to so many other parts, fine.  But how much is a dash?
It must depend on the value of "Part".

[spesh]

OK, so many parts to so many other parts, fine.  But how much is a dash?
It must depend on the value of "Part".

I have flexed my Google-Fu, and the consensus appears to be that a dash is one eighth of a teaspoon.

And while we're at it...

2 pinches = 1 dash

2 smidgen = 1 pinch

In the context of cocktails, a "part" can be any volume you like, it's just a way of ensuring the proportions are right.