Concentrated Brew: Set up your Phin with the coffee grounds. Use the Double-Bloom method: 1 tbsp of hot water in the lid and 2 tbsp in the chamber. Wait 2–3 minutes, then add the remaining hot water. We want a very dark, concentrated "stain" of coffee.
Prep the Base: Pour the condensed milk into the bottom of your tall glass.
The Milk Layer: Pour the whole milk (or coconut milk) directly over the condensed milk.
Pro Tip: For clean layers, pour the milk slowly over the back of a spoon held just above the condensed milk.
The Froth (Optional): If you like a foamy top, use your handheld frother to zap the milk layer for 10 seconds until a light foam forms.
The "Stain": Once your coffee has finished dripping, slowly pour the hot coffee into the center of the milk. It should create a stunning dark layer that slowly marbles into the white milk.
Serve: Fill the rest of the glass with crushed ice. Serve with a long spoon and stir only when you’re ready to drink!