Step 1

Spread 1/4 of scallion greens on a microwave-safe plate lined with a double layer of paper towels. Top with a second paper towel (do not press down). Microwave on high for 4 minutes, then continue in 20 second intervals until greens are papery, dry, and crumble when pinched. Repeat with remaining greens.

Step 2

Add greens to spice grinder or mortar and pestle. Grind until powdered. Store in an air-tight container.