Cut tea bags open and empty into a small bowl; discard tea bags.

Bring water to a boil in a saucepan; add loose tea. Boil tea until water becomes dark red, 3 to 5 minutes. Stir sugar into tea.

Grind cardamom seeds in an electric grinder or using a mortar and pestle. Stir ground cardamom, cinnamon, nutmeg, and ginger into tea; boil until flavors are infused, about 10 minutes.

Stir milk into tea and bring back to a boil for about 2 minutes. Pour tea through a sieve to separate out solids. Serve hot.