Toss pork loin with enough oil to coat. Season. Lay loin atop a bed of 1/2 the red onions and lemon slices on a baking sheet, casserole dish, or cast iron pan. Place remaining onions and lemon slices atop loin. Drizzle olive oil atop roast with a pinch of kosher salt and black pepper.

Bake at 300° for approximately 1 hour or until pork reaches desired doneness. Garnish with lemon zest.

Variations: Fresh parsely, basil, arugula, watercress, spinach, mint, celery seed, worchestershire, shallots, paprika, habanero, bacon, pancetta, parmesean, olives, rosemary, thyme, oregano, zucchini, squash, potato, sweet potato, celery root, turnips, butternut squash, sage, coriander seed,