Prepare your bananas by peeling and slicing them, I cut mine in half then slice them lengthwise. Coarsely chop your walnuts and set both aside.

In a large skillet, over medium heat, melt your butter. Add in your brown sugar, rum, vanilla, cardamom, and cinnamon and whisk to combine. Bring the mixture to a low boil.

Add in your prepared bananas and walnuts, cook until the bananas are tender and begin to caramelize, about 2 minutes.

Serve fresh over vanilla ice cream.