I'm cringing with morbid curiousity at what Marmite might taste like.
Nutella, I am all too familiar with... keep a jar in my fridge most of the time. I learned to refrigerate it because I had a jar that got sort of lost in the back of my pantry shelf, and it was a bit rancid.
My brewing methods have changed considerably... I am not nearly as careless and footloose as I once was. My old method was to brew and stew... leaves stayed in the tea more often than not. I brewed strong and concentrated, and usually bitter, but I was then diluting, sweetening, and drinking as iced tea. It was fine, I loved it, but it is certainly not suitable for finer teas that deserve to be enjoyed in their more pure state. I don't use a timer or a scale, so I am not hardcore yet, but I do have a measuring spoon and I do eyeball the clock when I am brewing my blacks and oolongs. On the occasion that I have greens, I do set a timer and use a thermometer if I hot-brew. but more often I will just cold-brew in the fridge, which I love.
Oolong #8 from adagio in my cup... not my favorite oolong by any stretch, but its ok. I miss my tung ting jade and TKY.