Heat the 1.65 litres of water to 90–95°C. Add the 5 black tea bags and steep for exactly 2½–3 minutes — no longer. Over-steeping releases harsh tannins that specifically clash with basil's delicate character and make the lemon feel sharp rather than bright, rather than the two integrating into a single cohesive profile. Remove the bags gently without squeezing. Allow the tea to cool to lukewarm. Ceylon or a light breakfast blend is specifically the correct tea here — its mild tannin and clean body provide structure without the heavier, more assertive character that would compete with basil's anise-adjacent freshness.

Stir in 2 tablespoons of mild honey while the tea is still warm, so it dissolves evenly rather than settling at the bottom. Taste and add up to 1 additional tablespoon only if needed. The drink should remain dry-leaning throughout this process — the honey's job is to smooth the tea's tannin edge and support the herbal profile, not to make the tea taste sweet. Cool the tea fully to room temperature before adding any basil.

Rinse the basil leaves and shake off excess moisture. Clap them gently between the palms once or twice — enough to release their aromatic oils, smelling bright and sweet, without chopping or muddling. Aggressive handling at this stage releases chlorophyll and bitter compounds that turn the finished infusion dull and vegetal rather than clean and fresh.

Add the prepared basil to the fully cooled tea and refrigerate for 10–15 minutes, tasting at the 10-minute mark. Remove all the leaves once a clean herbal aroma is clearly present. Basil rarely turns medicinal the way some botanicals do, but it does turn flat and cooked-tasting if left too long in the liquid — pull it early to preserve its freshness rather than waiting for a more intense result.

Add the single strip of lemon peel and infuse for 5 minutes to release its citrus oils, then remove it completely. Stir in 1 tablespoon of fresh lemon juice and taste. Add up to 1 more tablespoon only if the profile still feels flat. Lemon juice in this preparation is specifically a finishing adjustment rather than a dominant flavour — the peel has already done the work of providing fragrance.

Refrigerate for 1–2 hours until completely cold. Proper chilling specifically sharpens the basil's aroma, brightens the citrus, and allows the honey to settle into the background rather than sitting forward as sweetness. A drink served only partially chilled feels heavier and noticeably less integrated than the fully rested version.

Fill glasses with ice, pour the chilled tea, and garnish with fresh basil leaves and a lemon slice. Serve immediately while the aroma is at its most expressive.