Smash the spices roughly with a pestle and mortar or under a cloth with something heavy (so it doesn't jump everywhere). You just want everything to be slightly, not finely, cracked.
Toast the cracked spices in a pan over medium heat for 3 to 4 minutes, shacking occasionally, until fragrant.
Now add 1 liter of water and the thinly sliced ginger and bring to a simmer. If any water has evaporated from the pan due to the high heat from the toasting, be sure to top it off. Turn down the heat and allow to simmer gently for 5 minutes.
Remove from the heat, chuck in your 4 tea bags, cover with a lid and allow to steep for 10 minutes.
After 10 minutes remove the tea bags and stir in your sweetener until dissolved.
Strain the tea through a fine-mesh strainer into a pitcher and discard the spices and teabags.
You can keep the tea in the fridge until further notice or make yourself a cup: pour 3/4 c of warm tea in a mug. Froth 1/2 cup of milk and combine.