Regular black tea with milk...the English way.
Occasionally I put just a dab (1/8 of a tsp) of honey, just to put the slightest sweet to it...take the edge off.
My favorite type black tea is Assam, though hard to find...but I do get a certain brand at Fresh Market. It's a bold, rich, smooth black tea.
I also buy PG Tips. Also, as other traditional black tea drinkers mentioned here...English Bkfst, Irish Bkst, Scottish Breakfast. All good. I drink tea first thing in the morning. (sometimes follow up with a coffee later.)
Or as an afternoon pick me up or clear my head or whatever ails ya...I find it a soothing ritual.
What I do wish is that decaf tea tasted better. While I can do decaf coffee no problem, tastes just as good to me...decaf tea is tepid, bland, blah. I just want to lighten my caffeine intake, as I'm not a great sleeper and I think this might help. But just can't switch to decaf tea. Not the same.