A 1-liter French Press will allow you to brew about 6-8 cups of café con leche, obviously, depending on your taste and the coffee-milk ratio. The recommended ratio is equal amounts. You can also split the recipe in half if you have a smaller press or want to make less coffee.
Using an electric kettle, heat up approximately 30 ounces (or 3 ¾ cups) of water at 200 degrees Fahrenheit. If a kettle is not available, you can heat up the same amount of water in a saucepan and remove it from the heat as soon as it begins to bubble.
Next, preheat the French press, just like you would an oven before cooking a meal. Once the water reaches 200 degrees Fahrenheit, carefully add it to the press and allow it to sit for 30-45 seconds. Remove the water from the press.
Add 10-15 ounces of (coarsely ground) coffee to the press. Then, add enough water to cover the coffee. Do not push the press yet! Allow it to sit for 3 minutes.
Add enough water to reach the maximum capacity of the French press.
Finally, slowly press the plunger to extract the coffee. Itis best not to push it to the point where you are pressing the coffee grounds against the bottom. Instead, stop as soon as the coffee reaches the base. This way you do not end up with grounds or particles in your coffee.
Remove the coffee from the press or pour it into your already prepared warm milk. Below is the process for warming up the milk and serving your delicious coffee.