Preheat oven to 275. Melt butter, then add sugar and salt. Beat in eggs, then corn syrup and vanilla. Do not let the filling get hot before adding eggs or they will cook.
Stirring frequently, heat slowly until shiny and warm to the touch or about 1300. Toast pecans in preheating oven for about 7 minutes. Remove from heat and add toasted pecans.
Pour into warm baked pie shell and cook until set in the center – about 50-60 minutes. Do not over cook, center should be soft and like gelatin. Timing is very important so that the pie shell is done in time but not too soon.