Add vodka and orange juice to the glass and stir gently to combine.
Slowly pour grenadine down the side of the glass or over the back of a bar spoon so it sinks and creates a sunrise effect.
Garnish with a maraschino cherry and an orange slice. Do not stir after adding grenadine.
Optional: For a lighter drink, add a splash of soda water on top just before serving.
Notes
Serve immediately while cold for the best flavor and clean layers. Try grapefruit juice for a tarter twist or pineapple juice for a tropical note. Clear, tall glassware (like a Collins glass) shows off the gradient best.