Pork Tenderloin in a Sweet Citrus Sauce without meat

4 teaspoons extra virgin olive oil , divided 1 1/2 teaspoons ground coriander 1 teaspoon kosher salt , divided 1/4 teaspoon fresh ground pepper 1 -1 1/4 lb[...]

2 lbs pork tenderloin 3 large sweet potatoes , peeled and cubed 2 firm ripe bosc pears , not peeled and cut into 6 wedges 1 medium Spanish onion , sliced thin[...]

2 tablespoons unsalted butter 2 large vidalia onions or 2 large other sweet onions , sliced 2 tablespoons firmly packed dark brown sugar 2 tablespoons[...]