Combine flour, cocoa and salt. In a separate bowl
Cream together butter and sugar until light and fluffy.
Mix in the egg yolk, milk and vanilla. Stir in flour mixture until just combined.
Chill dough in the refrigerator for one hour.
Preheat the oven to 350 degrees Fahrenheit.
Whisk egg white in a shallow bowl until frothy.
Place chopped pecans in another shallow bowl.
Remove dough from the fridge. For each cookie, scoop out less than a tablespoon and roll into a small ball.
Roll each ball in the frothy egg whites, and then roll and press in the chopped pecans. Place on a greased baking sheet or silicone baking mat.
Use the back of a small round measuring or soup spoon or your thumb to make an indentation in the center of each dough ball or use your thumb.
Bake for about 10-12 minutes, or just until set. Don't overbake, as cookies will harden as they cool.
As the cookies come out of the oven, gently repress the indentations with a small round spoon.
In a microwavable bowl mix the caramel bits and water. Microwave at 30-second intervals, stirring after each interval, until caramel is melted (1-2 minutes).
Pour small spoonfuls of caramel into the indented cookies. Let cool.
Melt chocolate and drizzle lines over cookies.