Masala Chai

1 1/2 cup water
1 inch stick cinnamon
8 cardamom pods
8 whole cloves
2/3 cup milk
6 teaspoons sugar (or to taste)
3 teaspoons and unperfumed loose black tea.

Put water into a saucepan. Add the cinnamon, cardamom and cloves, bring to a boil. Cover, turn heat to low and simmer for 10 minutes. Add the milk and sugar and bring to a simmer again. Throw in the tea leaves, cover and turn off the heat. After 2 minutes, strain the tea into two cups and serve immediately.

Serves 2.

Yogi Tea (Chai)

1 teaspoon cardamom pods
1 teaspoon ginger root
2 cinnamon sticks
1/2 teaspoon peppercorns
1 teaspoon cloves
5 cups boiling water

Simmer for 25 minutes. Remove from heat, add 1 teaspoon black tea and 2 cups milk. Heat almost to a boil.

Edit: Chai is typically served sweetened with sugar. Add sugar or sweetener to taste.
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Another Kansas City recipe. I like to steep the spices for a long time (hours)before I add the tea and milk.

Updated

To make by the gallon:

3 teaspoons cardamom pods
3 teaspoons ginger root
6 cinnamon sticks
1 1/2 teaspoons peppercorns
3 teaspoons cloves
15 cups boiling water

Simmer for 25 minutes. Remove from heat, add 3 teaspoon black tea and 6 cups milk. Heat almost to a boil. 

I store the extra in the fridge and heat up by the desired serving size. 

Edit: Chai is typically served sweetened with sugar. Add sugar or sweetener to taste.