Combine the sugar and 1/2 cup water in a small saucepan and heat over medium-low heat, stirring, until the sugar is completely dissolved, to make a simple syrup. Remove from the heat and let cool completely.
Combine the espresso, hazelnut liqueur, coffee liqueur, 1 ounce simple syrup and hazelnut or oat milk in a shaker filled with ice (save the remaining simple syrup for another use). Shake and strain into a large wine glass, filled with ice.
Garnish with grated espresso bean.
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