I found this recipe online, and am on my second batch - it's a great recipe that tastes just as good as anything you can buy at the store or get in a coffee shop. Plus, tons cheaper, and you can adjust the spices and sugar based on your personal preference.
1 14-ounce can sweetened condensed milk
1 teaspoon granulated sugar
1 teaspoon ground cardamom
1/2 teaspoon ground cinnamon
1/2 teaspoon ground cloves
1/2 teaspoon ground nutmeg
Empty condensed milk into a jar or plastic container with tight-fitting lid.
Stir in the sugar, cardamom, cinnamon, cloves and nutmeg. Store in refrigerator.
Brew a cup of strong black tea, such as Assam, then add two heaping
teaspoons of concentrate or more to taste.
Stir well until concentrate has fully melted.
To keep: Store in refrigerator for up to 6 months.