What’s Better Than S’mores? A Giant S’mores Tart

I never was a Girl Scout, so I came late to s’mores. I was already a teenager when I squished my first blackened marshmallow between graham crackers and chocolate after awkwardly thrusting a skewer amid the glowing embersSince no one had schooled me in the finer points of smelting a s’more, like rotating the marshmallow to an even shade of toasty brown or letting the molten blob rest on the chocolate for a…