First, dissolve the 5 grams of instant yeast in 300 milliliters of milk in a medium bowl.
Add 300 grams of flour and 5 grams of honey to the yeast-milk mixture.
Stir the ingredients together until they are well mixed and a smooth batter forms.
Cover the bowl with cling film and let the poolish rest at room temperature for 1 hour.
After resting, transfer the covered bowl to the refrigerator and let the poolish ferment for 24 hours.