Brew a shot of strong espresso and set it aside.
Grate about a teaspoon of fresh ginger using a microplane or fine grater, then add it to a small saucepan along with the ground cinnamon, nutmeg, and a tablespoon of molasses.
Pour the milk into the saucepan with the spice mixture and warm gently over low heat, stirring occasionally, until steaming and fragrant—about 5 to 7 minutes. Do not let it boil.
Once the milk is warmed, stir in the brewed espresso and adjust sweetness with honey or sugar, tasting as you go.
Froth the milk using a handheld frother or shake it vigorously in a jar with a lid until it’s creamy and frothy, about 20 to 30 seconds.
Pour the hot, frothy latte into a mug, spooning a little foam on top. Garnish with a cinnamon stick or a pinch of nutmeg if desired.