Fill a glass with ice. Add 1 ounce (2 tbsp) grenadine, then top with 8 ounces lemon-lime soda. Garnish with maraschino cherries if desired.
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Notes
Grenadine: A deep red, pomegranate-flavored syrup.
Soda: Modern Shirley Temples are made with white soda such as Sprite or 7UP. For a more traditional approach, substitute ginger ale (you could add a splash of orange juice, too).
Yield: Makes 8 drinks.
Roy Rogers: Substitute Coca-Cola for the Sprite.
Cherry juice: It's not the same as grenadine, but using the maraschino cherry juice from the jar tastes good too (and also makes a pink drink).