Japanese curry roux question

https://thelemmy.club/post/46306763

Go to a Japanese grocer and get the House Java curry blocks. It’ll pretty much ruin the golden circle roux cubes for you.
I’ve never heard of these products. What exactly is Japanese curry, and what does it taste like?
I’m not sure how to describe it, but its way different from my expectations and I feel like one day I’ll eat or drink something and say “it tastes kinda like japanese curry”