Add all ingredients to a mortar and make a smooth paste.
Pomelo is a big fruit and it's hard to juice it on a regular juicer. I peel the pomelo and remove the thin white skins, then blend it in a blender for a minute or two and use a nut milk bag or a tea towel to squeeze out the juice.
Mix together pomelo juice and simple ginger syrup, pour into glasses and add beer.
Recipe by Anja Burgar | Use your Noodles | www.useyournoodles.eu