About 30-60 minutes before you are ready to process your ice cream, make your cookie dough.
Place the butter in a medium saucepan over a low-medium heat. Cook, stirring regularly, until flecks of golden brown butter appear. It should smell warm, nutty and fragrant and be medium brown in colour. It should not smell burnt. When you reach this consistency, take the butter off the heat.
Measure the brown sugar in a medium heatproof bowl. Once the browned butter has cooled for about 5 minutes, pour it over the brown sugar.
Add 20ml (1 tablespoon) milk and stir to make a syrupy brown liquid. It is very important to add the milk before the tapioca flour – the mixture becomes pasty and floury tasting if you don’t add the milk first.
Add the heat-treated tapioca flour in batches. Continue mixing and adding flour until the mixture no longer looks and feels oily. It should look and feel like regular cookie dough. If you try to roll a ball of it in your hands, you should be able to do so easily. If it crumbles as you roll, add more milk.
Allow the cookie dough to cool before stirring in the finely chopped chocolate chips. You can leave the cookie dough in fine crumbles (as long as they are not dry) or roll them into little balls (which is my preference, see the body of the post). Place the dough into the fridge for at least 10 minutes and ensure it is completely chilled before the next step.