Place the coffee, cinnamon, peppercorns, honey and cocoa in a heatproof container.
Boil 3 cups water in a small saucepan or a kettle.
Pour boiling water over the coffee and spices and stir.
Let brew for 5 minutes.
Stir well and strain.
Refrigerate until chilled.
When ready to serve, fill a glass or bottle halfway and top off with soda water.
Carefully stir.
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