[iamkroot]

OP author here.

Yes, though you have to be careful. If you add too much alcohol you'll prevent your mixture from properly freezing.

David Leibowitz, author of "The Perfect Scoop" recommends no more than 45ml of 80 proof liquor per 1 liter of ice cream mixture.

[majikandy]

So just under a double shot of 40% abv spirit here in the uk per litre. You’re right, not that much is it.

[ender341341]

That matches my experience too 3 tbsp of vanilla/mint extract makes a much creamier result