• Adjust rack to top position (top and middle positions for 4 servings) and preheat oven to 450 degrees. Wash and dry produce. • Cut potatoes into 1/2-inch-thick wedges. Halve, peel, and thinly slice half the onion (whole onion for 4). Zest and quarter lemon. Halve buns.

• Toss potatoes on one side of a baking sheet (spread across entire sheet for 4 servings) with a drizzle of oil, half the Fry Seasoning (you’ll use the rest in the next step), salt, and pepper. • Roast on top rack for 12 minutes. (You’ll add more to the sheet then.)

• While potatoes roast, pat pork* dry with paper towels. Season with half the celery salt (all for 4 servings), half the thyme (you’ll use more later), remaining Fry Seasoning, and pepper. • Heat a drizzle of oil in a large pan over high heat. Add pork; cook until browned, 1-2 minutes per side. Turn off heat; transfer pork to a plate. Wipe out pan. • Once potatoes have roasted 12 minutes, remove sheet from oven. Carefully place pork on empty side of sheet; return to top rack and roast until pork is cooked through and potatoes are browned and tender, 8-10 minutes more. (For 4, leave potatoes roasting; add pork to a second baking sheet and roast on middle rack.) Swap in chicken for pork. Cook until browned and cooked through, 3-5 minutes per side. (Skip roasting chicken.)

• Melt 1 TBSP butter (2 TBSP for 4 servings) in pan used for pork over medium heat. Add sliced onion; cook, stirring, until softened, 3-4 minutes. • Stir in a drizzle of oil, flour, and remaining thyme. Cook, stirring, until mixture is lightly browned, 2-3 minutes. • Whisk in 1/2 cup water (1 cup for 4), stock concentrate, and 1/4 tsp sugar (1/2 tsp for 4). Bring to a simmer; cook, whisking constantly, until thickened, 3-5 minutes. • Turn off heat; season with salt and pepper to taste. Use pan used for chicken here.

• While onion cooks, in a small bowl, combine mayonnaise, mustard, and juice from one lemon wedge (juice from two wedges for 4 servings). • Toast buns directly on top rack of oven until golden, 2-3 minutes.

• Toss potatoes with lemon zest. • Spread a thin layer of creamy mustard sauce onto cut sides of buns. Fill buns with pork chops and saucy onion. • Divide sandwiches and potatoes between plates. Serve with remaining lemon wedges and remaining creamy mustard sauce on the side for dipping. Chicken is fully cooked when internal temperature reaches 165°.