This might be the coziest apple cider cocktail out there. Hot cider is its own unique delight, and the addition of black tea, vanilla, and gin makes for a rich, satisfying drink.
Bring the cider and vanilla to a boil in a small pot or a microwave-safe mug in the microwave. Remove from heat and add the tea bag; steep 3 minutes.
Remove tea bag and stir in the gin. Serve in 2 mugs with lemon slices.