Step 1
Preheat oven to 200 degrees F (95 degrees C). Line a baking sheet with parchment paper. Line a large plate with waxed paper.
Step 2
Beat egg whites coffee granules vanilla extract cream of tartar and salt with an electric mixer at high speed until soft peaks form 3 to 5 minutes. Add sugar 1 tablespoon at a time beating constantly until stiff but still glossy peaks form 3 to 5 minutes.
Step 3
Drop egg white mixture by rounded tablespoons 2 inches apart on prepared baking sheet (alternately fill a pastry bag fitted with a star tip with egg white mixture and pipe out 1- to 1 1/2-inch stars).
Step 4
Bake in the preheated oven until kisses are firm and dry about 2 hours. Cool on the baking sheet set on a wire rack for 1 hour.
Step 5
Melt chocolate in the top of a double boiler over simmering water stirring frequently and scraping down the sides with a rubber spatula to avoid scorching. Remove from heat and cool slightly.
Step 6
Peel kisses from parchment paper. Dip the base of each kiss in melted chocolate and transfer to waxed paper-lined plate. Freeze kisses until chocolate hardens 2 to 3 minutes.