Combine flour, salt, and sugar in the bowl of a stand mixer.
Add butter.
Mix on low speed until crumbly, about 1 minute.
Add pecans.
Continue to mix until it comes together, about 1 minute.
Turn out onto parchment paper.
Roll into a log about 10-12 inches long.
Roll up in parchment.
Cover with plastic wrap.
Refrigerate 3-4 hours, until firm, or overnight.
Heat oven to 375℉/190℃.
Line 2 baking sheets with parchment paper. Set aside.
Slice dough into ¼" rounds.
Place about 2-inches apart on prepared pans.
Bake for 12-15 minutes, until just starting to color.