Place sugar into desired container.
If using ground vanilla beans: Place whole beans into spice grinder and grind to desired consistency. If using vanilla caviar: split beans lengthwise with knife and scrape out seeds with a knife or spoon. Add ground vanilla beans or caviar to sugar.
Shake/whisk/mix sugar and vanilla together to evenly combine.
Optional: if using vanilla caviar, add used bean pods to container for extra flavor.
Cover container and store. Vanilla sugar can be used immediately but the flavor will continue to grow as it sits - we recommend waiting at least two weeks.