US recipes: Kosher Salt?

[MikeWozniaksMohawk]

What does this translate to for U.K. shoppers? Is it rock salt?

Sea salt, or flake salt. Anything with a slightly larger grain. Rock salt would be too heavy I’d think.

Sea salt, flaky, like Halen Môn or Maldon

Ah, of course. Thanks!

And if you think that's expensive "Waitrose cook's essentials" is Halen Môn at considerably less £/100grams

Doesn't all salt just dissolve though? (Not a cook!)

Kosher salt is always rock salt, and lower in impurities which makes it most effective for kashering meat and for brining in traditional Jewish cuisine.