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Traditional Scottish Tablet
(scottishscran.com)
Is it hard? It looks like scones. I see it compares it to some dulce de leche recipes, it looks similar to mantecol here, which we do it with peanut butter.
It's similar (ish) to fudge, but it has a pleasantly sandy texture that melts on the tongue. It crumbles a little as you bite it. Now I need to look up mantecol, thanks for the tip!
I just realised you might be asking if it's difficult, not if it's hard in texture, whoops. It's not hard at all with this recipe, but you need to keep an eye on it and stir often while it boils.