Pork with rolls

3 (11-ounce) packages frozen dinner rolls 8 teaspoons coriander seeds, divided* 1/4 cup olive oil 2 tablespoons kosher salt 1 teaspoon freshly ground black[...]

1 lb pork tenderloin 1/2 red onion , halved and very thinly sliced 1/2 cup red wine vinegar 1/2 teaspoon salt , plus more for seasoning pepper , to taste 8[...]