I feel like this question has been answered better elsewhere. but I'll give it a shot.
The taste is mild, like hay and sunshine. Sometimes I feel it has a slightly sweet taste. Better than a human's hands down. If they've recently urinated or squirt, then it's much more salty and may be gritty, but it's not overpowering.
Hope that helps!
And if you crave it, remember to get to know her first, she's yours, and she's into it. Please don't go sexually assault a random mare for shits and giggles.