Pour the hot water over the coffee phin filter and let the coffee drip into a heat-safe drinking glass.
Add 2 tsp condensed milk to the coffee.
Whisk the egg into the coffee and milk mixture.
Pour the mixture into a shallow bowl.
Dip a slice of thick-cut toast into the mixture on both sides.
Heat a frying pan over medium-low heat.
Add 1 tsp butter to the pan and swirl it around.
Place the toast into the pan and pan-fry over medium low heat for about 4-5 minutes on each side. Keep an eye on it as it does have a tendency to burn.
Repeat with the remaining toast.
Serve warm with condensed milk drizzle on top.
