1. Place a good layer of black sanding sugar in small ramekin or bowl. Rim the top edge of a test tube with amaretto, and immediately dip into the sanding sugar. Place the test tube into the test to rack to keep it upright. Repeat with the remaining test tubes.

2. Pour the amaretto into a measuring cup with a spouted edge. Carefully fill each test tube 1/2 full with amaretto (just eyeball it). In the same measuring cup, stir together the milk and chai latte concentrate. Carefully fill the test tubes until the cocktail is just below the edge of the test tube.

There will be a little separation at the bottom of the shots and the black sugar will start to bleed into the shot giving it a grey, streaked look. Serve immediately.