Add the black tea bags to the cold water in a large pitcher. Cover and refrigerate for 8–12 hours. Remove the tea bags without squeezing. The tea should be smooth and clean, never bitter.
Rinse the rosemary and gently clap it between your hands to release aroma. Do not chop or bruise aggressively — rosemary turns medicinal fast.
Add the rosemary sprig to the cold brew tea. Refrigerate and let infuse for 6–8 minutes only, just until a clear piney–herbal aroma develops. Remove promptly to avoid harsh notes.
Add the lemon peel strips and let infuse for 5 minutes, then remove. This step is purely aromatic — no acidity yet.
Stir in 2 tablespoons of honey until fully dissolved. Taste and add up to 1 additional tablespoon only if needed. The drink should stay dry and structured.
Stir in 1 tablespoon lemon juice. Taste and add up to 1 additional tablespoon only if needed. This is a correction, not a base.
Refrigerate for 1–2 hours until fully cold and integrated.
Fill glasses with ice, pour over the chilled rosemary lemon cold brew black tea, and garnish with a fresh rosemary sprig and a twist of lemon peel.