Strain syrup of tea leaves into measuring cup. Set aside to cool.
Fill a large pitcher with all ingredients. Stir well.
Pour into wine glasses and garnish with orange slice.
Which wine to use? Since I love Pinot Noir, that's what I used. But any mild red wine is perfect. The wine doesn’t have to be expensive. I used a $12 bottle of Pinot Noir.As for the liqueur, I used an orange-flavored Cointreau Triple Sec that melds beautifully with the amazing fruit flavor combination of cranberry and oranges. Serious Eats has a really nice field guide on orange liqueurs if you're undecided about which orange-flavored liqueur to use.For the black tea, I used my favorite Earl Grey because it's a nice bergamot orange flavored tea. The strong Ceylon and Assam black tea is able to compete with the heavier red wine and cranberry flavors. As you know, Earl Grey is a black tea infused with bergamot oil so it's a perfect tea to blend with an orange liqueur, as I did with my Enchanting Earl Grey Tea Cocktail.I let my sangria infuse overnight in the refrigerator. The longer you let your sangria sit before drinking it, the more the fruit will infuse its flavors into the cocktail. And the more the alcohol will soak into the fruit. Everything about this cranberry sangria is fabulously delicious.