rendering - What is causing this reflection on a surface? (Blender Guru coffee cup tutorial) - Blender Stack Exchange
cycles render engine - Create a gradient effect, like for coffee? - Blender Stack Exchange
Handheld Milk Frother, Electric Hand Foamer Blender for Drink Mixer, Perfect for Bulletproof coffee, Matcha, Hot Chocolate, Mini Battery Operated Milk Whisk Frother (Black) - Walmart.com
cycles render engine - Create a gradient effect, like for coffee? - Blender Stack Exchange
Model the Perfect Cup of Italian Coffee in Blender · 3dtotal · Learn | Create | Share
If you want to add foam to your coffee, here's how : r/BlenderDoughnuts
Making realistic procedural coffee in Blender - YouTube