Start with bananas that are turning brown. Peel and cut into large pieces, then freeze in an airtight bag or container.
To make the ice cream, throw around 2-3 frozen bananas into a food processor, adding a pinch of salt and 2-4 tbsp milk of choice for smoother blending if desired.
Blend until you achieve a soft-serve texture. You can serve immediately, or transfer to a container and freeze an additional 30 minutes, then scoop out with an ice cream scoop.

2-3 overripe frozen bananas
optional milk of choice, if needed
pinch salt.