Mixing coffee and milk.

The order of adding milk to coffee or coffee to milk is largely a matter of personal preference. 

Some people prefer adding milk to coffee, while others prefer the reverse. 

The main difference is in how the milk and coffee mix, which can slightly affect the taste and appearance of the drink. 

Here's a breakdown of the different approaches: 

Pouring milk into coffee: 

More common:
This is the most common way to add milk to coffee. 

Easier to control:
It allows for more precise control over the amount of milk added, especially when using a small amount of milk. 

Subtler taste change:
The milk tends to swirl into the coffee more gradually, potentially resulting in a less drastic change in flavor and a more visually blended drink. 

May prevent milk from scorching:
If you are using a steam wand, adding milk to coffee first can help prevent the milk from scorching, as it is not in direct contact with the heating element for as long. 

Pouring coffee into milk: 

Less common:
This method is less frequently used. 

Potential for more dramatic mixing:
The coffee, when poured into the milk, can mix more vigorously, potentially leading to a more dramatic change in the drink's appearance and flavor. 

Might create a more pronounced coffee flavor:
Some believe that this method can lead to a more pronounced coffee flavor in the final drink, as the milk is less likely to dilute the coffee initially. 

May require more milk:
This method might require a slightly larger amount of milk to achieve the desired dilution, as the coffee will initially be more concentrated. 

Ultimately, the best way to mix coffee and milk is the way you prefer. 

Here are some additional factors to consider:

Type of coffee:
The type of coffee you're using (e.g., espresso, drip coffee) and the desired strength can influence how much milk you need and how it mixes with the coffee. 

Type of milk:
Different types of milk (e.g., whole milk, skim milk, almond milk) have different fat and protein content, which can affect the taste and texture of the coffee. 

Personal taste:
Some people prefer a more subtle coffee flavor, while others prefer a stronger coffee taste. Experiment with both methods to see which one you like best. 

Visual appearance:
Some people prefer a more blended look, while others prefer a more layered or marbled effect.