Zest all the citrus fruits

Combine water, zests, cinnamon, coriander, nutmeg in pot/saucepan. Whisk together until everything is well mixed.

Stir in sugar while bribing to a boil.

While waiting for boil, juice the citrus fruits.

Boil 1 minute

Remove from heat. Stir in citrus juices, browning sauce, and vanilla.

Should last a couple weeks in the fridge.

Mix with carbonated water to taste. 1 part syrup to 3 parts water results in a stronger taste, while I go up to 1 part syrup to 4-5 parts water for a little less strong flavor.