Heat oven to 180°C. Place pecans onto an oven tray (lined with baking paper) and cover with butter.
Bake pecans until a shade darker then remove from oven, blitz in a processor, then place in the fridge to cool for at least 30 minutes.
Add the milk, cream, vanilla and sugar to a bowl and whisk until the sugar is completely dissolved.
Add ice cream base to your ice cream maker and follow manufacturer's instructions to churn. Once the ice cream is almost finished churning add pecans.
Pour into an airtight container once churning is complete and freeze for at least 3 hours to harden.