[header] How to dye your eyebrows with coffee [title] Combine the leftover coffee grounds and cocoa powder. [step] Add 2 tablespoons (21 g) of coffee grounds and 1 teaspoon (3 g) of cocoa powder to a small bowl. Mix the two ingredients well so they're fully combined. 
[substeps] Be sure to use caffeinated coffee grounds. Caffeinated coffee usually offers a richer color, and the caffeine is also thought to stimulate hair growth so it may help if your brows are sparse or patchy.