Combine milk, whipping cream, brown sugar, chopped dark chocolate, ginger, cardamom pods, star anise, cloves, cinnamon, black peppercorns, and water in a large saucepan.

Bring the mixture to a boil over medium-high heat, stirring until the chocolate is melted.

Add the black tea bags to the saucepan.

Cover the saucepan, reduce the heat to low, and simmer for 10 minutes.

Pour the mixture through a fine wire-mesh strainer into a heatproof pitcher to remove solids.

Serve warm or chilled over ice.