The Blinker first appeared in Patrick Gavin Duffy's The Official Mixer's Manual (1934). I learned of it from my copy of Vintage Spirits and Forgotten Cocktails. It is a rather simple cocktail but tasty.
Add all of the ingredients to a mixing glass. Fill about ¾ full with ice, cover with a Boston shaker and shake vigorously. Garnish with a lemon twist and enjoy.
Note: I substituted grenadine for the raspberry syrup, but I think that the raspberry syrup might be the way to go.
2 ounce rye whiskey
1 ounce grapefruit juice
1 teaspoon raspberry syrup