Add the ginger, star anise, black peppercorns, nutmeg, cloves, and cardamom to a food processor
Pulse 4-5 times, or until everything is roughly chopped
Transfer to a large pot, along with the tea bags, vanilla bean, cinnamon sticks, and filtered water
Bring to a simmer over low-medium heat
Let simmer for 5 minutes
Turn off the heat and stir in your sweetener of choice
Cover the pot and let steep until cooled
Strain and transfer the chai concentrate to an airtight container
Store in the fridge for up to 2 weeks
