I'm baking a genoise cake consisting of flour, eggs, sugar, and optionally some melted butter. I want to add a strong tea flavour to it.
The only type of tea I currently have and want to use is loose leaf black tea. I don't want to use matcha powder, tea bags, or anything like that. I also have a bunch of spices that aren't water-soluble.
How can I add tea to the batter without messing it up?