system
Given the following post, respond as if you're commenting on Reddit:
human
eli5 Why does powder mixed into liquid create clumps? eg: hot chocolate or coffee mixed into water.

Bonus follow up: is it better/easier to pour the water over the powder, or the powder into the water?
gpt
Cacao power contains fat (cacao butter), which is hydrophobic (repels water). This makes such powders clump together.

Best way to make hot chocolate:

1. Add Cacao in mug
2. Add a **very small amount** of water/milk. (Hot liquid is better.)
3. Mix. It will be sticky, but smooth.
4. Add additional water/milk.