Drink | Frozen Salted Espresso Martinis

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1 ⅔ cups brewed espresso, at room temperature
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6 tablespoons (3 ounces) coffee liqueur (such as Kahlúa)
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¼ cup (2 ounces) vodka
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1 tablespoon tablespoon simple syrup
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Flaky sea salt (such as Maldon)
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6 coffee beans
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Pour espresso into an ice cube tray. Freeze until solid, about 4 hours.
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Process espresso ice cubes, coffee liqueur, vodka, and simple syrup in a blender until smooth, about 1 minute. Pour evenly into 2 chilled coupe martini glasses; garnish each with a pinch of sea salt and 3 coffee beans. Serve immediately.