In a small mixing bowl, combine the instant coffee, sugar, and hot water. Using a whisk or a handheld mixer, beat the mixture vigorously until it transforms into a thick, creamy foam with soft peaks—this should take about 2 to 5 minutes, depending on your speed. The color should shift to a rich caramel tone, and the texture should be airy and smooth.

Pour cold or warm milk into a glass, leaving enough space at the top for the whipped coffee layer. Spoon the fluffy mixture over the milk, creating a striking two-tone effect. Before drinking, stir the layers together for a perfectly balanced blend of creamy milk and bold coffee flavor. Serve immediately and enjoy this velvety, café-style treat at home.