Place coconut milk, almond milk, matcha, dates, and honey in a blender and blend until well combined. Add xanthan gum and mix again. Taste and adjust flavor as needed, adding more green tea powder, dates, or honey.
Transfer to a mixing bowl and let chill for at least a few hours. Then pour into a pre-chilled ice cream maker and operate according to manufacturer's instructions.
Once finished churning you can either eat it as soft serve or transfer it to a freezer-safe container and let harden for 4-6 hours.
Be sure to set out 20-30 minutes before serving to allow to soften.
If you don't have an ice cream maker, simply pour the "batter" into a freezer-safe container, cover, freeze, and stir/whisk every hour or so to aerate.
Will keep in the freezer for a week or so. Best when consumed fresh. I'm sure it would be lovely with pomegranates, fruit compote, or cacao nibs.