1 oz of Vodka
1 oz of rosso vermouth (or sweet vermouth)
1/2 oz of grenadine syrup
1 splash of maraschino cherry juice (or cherry)
Mix vodka, vermouth, grenadine, and cherry juice in a shaker with lots of ice. Shake very thoroughly, and then strain into a cordial or cocktail glass. Garnish with a maraschino cherry, and serve.