Heat cream, milk, salt, and brown sugar in a saucepan until hot but not boiling.
Whisk egg yolks until light, then gradually add hot liquid to temper.
Combine tempered yolks with the hot liquid in the saucepan.
Cook and stir until mixture reaches 170°F or coats the back of a spoon.
Remove from heat, add vanilla, cool over ice bath, then chill in the fridge.
Melt butter in a skillet, toast pecans for 3-5 minutes, and let cool.
Pour chilled ice cream base into an ice cream maker and churn for 20-30 minutes.
In the last few minutes of churning, add cooled pecans and browned butter. Freeze ice cream for at least 4 hours before serving.