Before you begin, you'll need to preheat your oven to 350F.
Grab a mason jar (or any jar that can be sealed) and add both the sugar and food coloring. Start with just a few drops of food coloring, and add more if needed. Shake well.
Grab a baking sheet and evenly spread out your sugar. Place in the center of your preheated oven for around 10 minutes.
Remove from oven and then store in an airtight container. If you'd prefer not too add sweetness, you can use salt instead of sugar. This is great for sharper drinks like margaritas and tequilas.