Tea imparts delicate aroma to custards when extraction is controlled. Bitterness comes primarily from tannins and other polyphenols that are more soluble at high temperatures and long contact times, so the core strategy is to extract enough flavor without pulling harsh compounds. Harold McGee, author and food science writer, explains how temperature and time influence extraction in tea and other plant-based infusions. The Harvard T.H. Chan School of Public Health identifies catechins and tannins as the polyphenols responsible for tea’s astringency and bitterness, which helps explain why steeping technique matters for a creamy custard.
Choose tea and technique
Select teas that match the custard’s intent: delicate green teas and Japanese sencha offer grassy, floral notes that pair with vanilla; oolong gives floral-fruity nuance; black teas add robust, malty character but risk bitterness if mis-handled. Consider using powdered forms like matcha to avoid steeping extraction altogether: matcha disperses into dairy and yields immediate, clean green-tea flavor without prolonged hot contact. For brewed teas, prefer shorter steeps at lower temperatures or use a cold infusion. Cold-brewing tea in milk or cream for several hours or overnight extracts gentler flavor compounds and fewer tannins, a technique used by pastry chefs who want brightness without astringency.
Control extraction and cooking
Infuse tea into the cream or milk before combining with eggs, then strain thoroughly. Heat the dairy slowly to just under simmer, hold briefly, and remove from heat to steep; alternatively, warm the dairy gently and steep at lower temperatures to limit tannin release. Straining through a fine sieve lined with cheesecloth removes fine particles that continue releasing bitter compounds. When integrating with eggs, temper the yolks gradually and cook the custard over low, even heat until it just thickens, avoiding high temperatures that can concentrate flavors and create astringency. If bitterness appears, finishing with a small amount of sugar, a touch of salt, or an acid like lemon zest can balance perception without masking the tea.
Cultural practices inform technique: Indian masala chai traditionally endures long boiling to build flavor that survives milk and sugar, while Japanese tea traditions emphasize precise, low-temperature preparation to preserve subtlety. Matching the infusion method to the tea’s terroir and the custard’s texture yields flavorful, balanced results.