For Sour Sugar: Blend ingredients in blender to a fine powder. Store in airtight container at room temperature until ready to use.
For Garnish: Coat rim of glass with simple syrup then sprinkle with Sour Sugar.
For Margarita: Blend simple syrup, lime juice, tequila and ice in blender until smooth. Add candy pieces and pulse to combine. Pour into prepared glass. Swirl in curacao.