Taken from http://bakingsheet.blogspot.com/
Thinly slice the bananas and put them into a medium skillet over medium heat to cook until golden brown all over. Transfer to a large bowl.
Whisk together sugar, buttermilk and vanilla in a medium bowl, dissolving most of the sugar, then stir it into the bananas. Refrigerate until cold (at least 30-60 minutes).
Pour mixture into your ice cream maker and freeze as directed (should take about 15-20 minutes). Add in walnuts, if using.
Transfer to a freezer-friendly container with a lid and freeze until firm (at least 30 minutes) before serving.
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