A blend of Kenyan (which dominates) and Ethiopian coffee.
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I did a lot of these kind of experimenting earlier when I gave more time to this coffe related stuff. Just follow your intuition (one of the best tool you own) and see where it takes you 😉
I value my Tme for other things today and I trust my machine & those who do this blending professionally in one way or the other for my daily boost (s).
Right now, the protein & coffee blending is of interest.
Ordered a new Latte protein bag yesterday. They also have some Mocha and Caramel Coffee protein that I might have to try for espresso mix later. Can't recall the exact taste right now, was some yrs ago. Life, what an adventure 🙂
My blending experiments are not especially scientific, but I do know that I don't much like commercial blends that one buys because I don't think that they actually 'get' it.
To my mind, some of the best blends are like the food wine pairings you get in France; the food from a given region matches best with the wine from that region.
Thus, I think that coffees from central America would blend well together, and likewise, I think that African coffees go well together.
My own personal favourites have had a blend of one, or sometimes, two, types of Ethiopian coffee (60%, or 66% or 70% or even 75% between them) and perhaps a Kenyan or Rwandan (or Yemen coffee) making up the balance.
Ethiopian coffee is so lightly roasted that if it is represented in a blend (especially with sturdy, robust central or South American coffees) at around 10-20%, frankly, it is swamped, and what it can bring to a coffee (those clear, 'bright' notes) vanishes entirely under the weight of the other, more robust coffees.