Soak cashews until soft, then blend with remaining milk until smooth.
Cook oats with half the milk until soft, then add to blender with cashews, syrup, butter, vanilla, and salt. Blend until smooth.
Strain mixture, chill in fridge for at least 4 hours or overnight.
Make candied pecans by mixing chopped pecans with syrup, butter, cinnamon, and salt, then bake at 160°C for 15-25 minutes, stirring halfway. Cool and store.
Churn chilled mixture in ice cream maker, adding candied pecans in last minute. Freeze for 4 hours before serving.
Notes
Ensure the ice cream mixture is thoroughly chilled before churning for best results.