Similar idea, for coffee:
Ignore the terrible name. "Clever Dripper", for God's sake.
But a genuinely good idea: a coffee filter holder with a valve in the bottom, which is held shut by the weight of fluid when you pour the hot (not boiling!)
water into it, but then opens when you sit it on top of your coffee mug. Allowing the coffee to brew for a few minutes inside the filter instead of running straight out the moment you pour the water on. So a kind of cross between filter / jug / cafetiere. Simple and effective. Once the initial multiple Nespresso shots have succeeded in cranking open my eyelids of a morning, this now serves as my all-day coffee-delivery system.
My only caveat is that it's made of what seems to be quite brittle plastic - despite careful handling, I managed to chip several lumps out of the first one of these I owned, before finally managing to snap the valve off completely (not sure how I did that)
. So nowadays I treat it with the same caution as the finest crystal, rinse it out thoroughly after each use (never in the dishwasher)
and always keep a spare just in case. Would be bereft without it.