Combine all the ingredients except oranges and sour cherry concentrate in a large bowl. Bring it to a boil and let it simmer on low heat under the lid for about 20 min.
Add sliced oranges, simmer for 10 min; remove from heat and let it steep for 15-20 min.
Strain your drink and add sour cherry concentrate.
Serve warm in the winter or cool in the summer. Garnish each glass with an orange slice, seedless cherry (optional) and cinnamon stick.