Can you brew coffee with milk instead of water in a drip bag?

No. Testing shows milk cannot replace hot water for drip bag extraction. Its high protein and lactose content gives it far weaker extraction power, so standard drip bag brewing with milk produces a weak, sometimes sour cup. When milk contacts the grounds, fine particles swell and clog the filter bag, and the process can stretch to twenty minutes, losing the convenience drip bags are meant to offer.

A workaround tested first blooming with hot water, then adding milk heated to 75°C in two stages, with bean choices adjusted by roast level. The result still fell short of a proper home latte. For anyone wanting brewing coffee with milk, easier options exist, but they do not involve running milk through the drip bag itself.

Drip bag coffee has always been mainly brewed with hot water, but some coffee lovers prefer a rich and smooth taste, so they try to directly extract drip bags with milk, hoping to make a home-style latte. Can milk actually replace hot water to complete the extraction? Through actual testing, Front Street found that because milk has a high content of protein and lactose, its extraction ability is far inferior to hot water. If the regular drip bag brewing method is directly applied, the result is often a cup of coffee with a weak flavor or even sourness. To make up for this shortfall, Front Street tried first blooming with hot water, then injecting heated milk in stages, and gave bean selection suggestions for different roast levels. However, the actual test results showed that after the milk comes into contact with the coffee grounds, the fine particles swell and clog the filter bag, and the whole process takes as long as twenty minutes, which is far from the convenience that drip bags are meant to offer. So, what easier options are there for those who want a drip bag milk coffee? This article will reveal them all.

Coffee needs to be brewed with water—this is common knowledge everyone understands, but some friends have sudden whims and try to brew drip bags directly with milk, hoping to get a cup of rich and silky "latte." So here's the question: is brewing drip bags with milk actually feasible?

In fact, milk serving as a coffee extraction liquid is not the first time this has appeared in Front Street's tests. Last year we published an article titled "Pour-over coffee brewed with milk—is it feasible?" in which we already pointed out that the substances contained in milk are too abundant, and its extraction efficiency simply cannot compare with ordinary hot water; moreover, once it is heated to a scalding state, a large amount of protein and lactose components are lost, making the taste worse instead. Therefore, if conventional brewing parameters and techniques are copied over to brewing drip bags with milk, it clearly will not work.

To improve the shortcoming of milk's insufficient extraction ability, Front Street decided to first do a bloom with hot water, that is, let the coffee grounds first absorb enough water so that flavor substances can be better released in the subsequent stage, then heat the milk to 75°C and pour it in two stages.

To avoid the brewed drip bag milk coffee turning out sharply sour or weak in flavor, Front Street still recommends giving priority to categories labeled medium and dark roast, such as Front Street.Bird of Paradise drip bags with almond and cocoa aromas, Front Street.Queen's Estate drip bags with creamy peanut flavor, the full-bodied Front Street.Golden Mandheling, and Front Street.Huilan drip bags with prominent caramelized aromas. These pair more harmoniously with hot milk;

However, if you are more sensitive to bitterness, then choose drip bags with fermented fruity acidity. You can buy categories such as Front Street.Sidra drip bags, Front Street.Big Belly drip bags, Front Street.Strawberry Candy drip bags, and so on, because this type of coffee also has preserved fruit, fruity aromas, fermented wine aroma, and a certain caramelized flavor, making it quite suitable to drink with milk.

What if you brew drip bags with milk?

First prepare a tall glass and a pack of fresh Front Street Strawberry Candy drip bag coffee. After tearing open the packaging, hang it on the rim of the cup (so everyone can see more intuitively, Front Street will add timing and weighing in this brewing).

For the first stage, pour hot water at 90–93°C into the drip bag until the filter bag is half full (after boiling, turn off the heat and leave the lid open at room temperature for 1 minute). The water amount is about 25 g. Try to maintain a small stream; if using a gooseneck kettle, you can appropriately pour in circles;

After the coffee liquid has dripped out, begin pouring the second stage. Pour 75°C hot milk (hot enough that your hand cannot touch it) into the coffee bed until the filter bag is nine-tenths full. When the coffee liquid is about to finish dripping, continue pouring the next stage until nine-tenths full. The total amount of water and milk is 150 g.

Visually, the whole cup of coffee shows a fairly strong milk tea color. As far as the coffee taste alone is concerned, Front Street thinks the richness and aroma both pass. Drinking it directly, you can perceive the flavors of strawberry jam, raisins, and cream. Whether drunk directly or with ice, the taste is pretty good.

However, after the coffee comes into contact with the milk, the fine particles expand faster, thereby clogging the gaps in the filter bag, so the flow rate during the second extraction stage slows down noticeably, and the total drip time reaches as long as 11 minutes.

Counting the time to prepare all the ingredients as well, Front Street spent 20 minutes on this Big Belly drip bag before barely getting this cup of milk coffee, not to mention still having to wash the utensils used to heat the milk. This clearly runs counter to the convenience that drip bags pursue. Therefore, for friends who want to quickly make a cup of milk coffee with a drip bag, Front Street does not recommend this direct pouring method.

Drip bags + milk—what else can you do?

Drip bags have been developing in China for many years, and regarding combinations of milk with them, everyone has also figured out quite a few new ways to enjoy them in daily life. Front Street happens to have two here.

Another method is more suitable for friends who prefer iced milk coffee, and the steps are extremely simple. As long as you have drip bag coffee packs, a bottle of milk (fresh milk tastes better), and a refrigerator, you can easily achieve "latte" freedom after a sleep.

The operation is very simple. After taking out the drip bag, there is no need to tear it open. Just peel off the outer paper shell, then drop it "bare" into the milk. Tighten the bottle cap and shake it vigorously up and down, with the aim of letting the milk soak through the coffee grounds inside. Because it is cold extraction, Front Street thinks the ratio of coffee to milk does not need to be too strict; roughly keeping it between 1:12 and 1:15 is fine. For example, here Front Street uses one 10 g drip bag coffee with 150 ml fresh milk.

Then, put the milk with the drip bag soaking in it into the refrigerator and chill it overnight. The next morning (after about 8–12 hours), take it out and shake it vigorously a few more times, remove the drip bag, and the milk coffee is done.

The above content is compiled by CoffeeHunters, a coffee news website.