The first method: put two or three slices of ginger into 300ml of cola to boil, and take it out immediately after it has just boiled or is close to boiling.
The second method: put two or three slices of ginger in about 300ml of cola, and put it in the microwave oven for one minute with medium-high fire (the time depends on the power of the microwave oven). When they are boiling or near boiling, take them out immediately.
Cooking in the microwave oven can keep the steam of coke very good, and it tastes good. Drink it while it's hot.