If using a mixer:

Use the paddle attachment. Mix sugar and molasses together, slowly for several minutes, stopping to scrape down, until the clumps smooth out and mixture becomes almost homogeneous. Let sit for five minutes, then scrape and mix again.

If using a food processor:

Add sugar to food processor, using the blade attachment. Drizzle in molasses while pulsing. Pulse until mixture becomes almost homogeneous, stopping to scrape down. Let sit several minutes, then scrape and pulse again.

Bag promptly. If mixture sits out, it can feel dry on the edges; once it’s bagged, it will smooth out.