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If using instant coffee, mix it with 2 tablespoons of hot water until dissolved. For brewed coffee, make it strong so it holds its flavor against the milk. Pour it into your mug.
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In a small saucepan, warm the milk over medium heat until it starts to steam. Do not let it boil.
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Whisk the milk quickly with a hand whisk or use a blender for 20–30 seconds until it becomes foamy. You can also pour it into a jar, close the lid, and shake it vigorously for about a minute.
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Pour the warm milk into your mug, holding back the foam with a spoon. Then, spoon the foam on top to finish.
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Sprinkle a little cinnamon, cocoa powder, or nutmeg on top if you like.