10tablespoons140gr unsalted butter, melted and cooled
1/4cup60ml plus 2 tablespoons heavy cream
1teaspoonpure vanilla extract
Red food coloring
Cut out a 3-by-6-inch rectangle from a cardboard, or plastic plate like me.
Preheat oven 400 degrees.
Mix the egg whites and sugar with an electric mixer on medium speed until foamy. Reduce the speed to low and stir in flour and salt. Mix until just combined. Then add butter, cream and vanilla and continue to mix until smooth.
Pour about 1 cup of the batter into a clean bowl and add red coloring. Mix until well combined and transfer it to a pastry bag with a small round tip.
Put the prepared stencil on a baking sheet lined with a silicone mat and spread about 1 tablespoon of plain batter inside the rectangle. Then remove the stencil and draw a diagonal stripes with colored batter onto each rectangle.
Bake the cookies about 6-8 minutes. The cookies are ready when the edges turn golden brown. Keep a close eye on it, as it can burn quickly.
As soon as the cookies are out of the oven, loosen the edges with spatula and flip them over. I found that if they are undercooked, they don’t loosen easily. Roll the cookie sheets into a stick as fast as you can. Be very careful though, it’s hot! Immediately move on to the next one.
Store in an airtight container at room temperature.