We’ve all had one (or 300) — but how many of us can recite the history of the pork tenderloin? The next time you reach for Indiana’s unofficial state sandwich, you can spout off these fun facts. Indiana foodie historians believe the pork tenderloin as we know it was first served in the early 1900s by Nick Freienstein, the son of German immigrants. It seems likely that Freienstein riffed off of the Viennese wiener schnitzel — no, not the national hot dog chain. A traditional wiener schnitzel is a thin, breaded, and fried cut of veal. Freienstein used the widely-available pork instead, slapped it between two buns, added pickles, and voila — the pork tenderloin was born…