Meanwhile, melt butter in a small heavy saucepan over medium heat. Add brown sugar, whisking until smooth. Remove from heat and whisk in corn syrup, vanilla, zest, and salt. Lightly beat eggs in a medium bowl, then whisk in corn syrup mixture. Put pecans in pie shell and pour corn syrup mixture evenly over them.
https://www.epicurious.com/recipes/food/views/old-fashioned-pecan-pie-356072

