In a heavy saucepan, over medium heat, melt 3 tbsp. butter; add pecans and cook 5 minutes or until browned.
Remove from heat and place pecans in separate bowl; set aside.
Using the same saucepan, melt remaining 4 tbsp. butter.
Whisk in brown sugar, flour and corn syrup until thoroughly blended.
Cook on high for 6 - 8 minutes until sugar is dissolved and sauce thickens.
Remove from heat and let stand 2 minutes.
Stir in evaporated milk and pecans; combine and allow to cool and thicken; about an hour.
Once sauce thickens spoon over cheesecake and serve with whipped cream.