3Adjust racks to top and middle positions and preheat oven to 450 degrees. Wash and dry all produce. Dice sweet potatoes into 1/2-inch pieces. Toss on a baking sheet with a drizzle of oil, salt, and pepper. Roast on top rack for 12 minutes (we'll roast the zucchini then).
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5Meanwhile, halve and core apple; thinly slice into half-moons. Peel and finely chop garlic. Quarter lemon. Trim and halve zucchini lengthwise; cut crosswise into 1/2-inch-thick half-moons. Toss on a second baking sheet with a drizzle of oil and a pinch of salt and pepper. Set aside.
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7Pat pork dry with paper towels and season all over with salt and pepper. Heat a drizzle of oil in a large pan over medium-high heat. Add pork and cook until browned and cooked through, 4-5 minutes per side. Turn off heat; transfer to a plate.
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9Once sweet potatoes have roasted 12 minutes, transfer baking sheet with zucchini to middle rack and continue roasting until both veggies are browned and softened, 12-15 minutes more.
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11Meanwhile, melt 1 TBSP butter (2 TBSP for 4 servings) in pan used for pork over medium-high heat. Add apple and season with salt and pepper. Cook, scraping up any browned bits from bottom of pan, until apple is slightly softened, 2-3 minutes. Add garlic; cook until fragrant, 30 seconds. Add 1/z cup water (3/4 cup for 4), stock concentrate, and 11/2 tsp sugar (3 tsp for 4). Cook, stirring, until sauce has thickened and apple is very tender, 3-5 minutes. Season with salt and pepper.
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13Remove pan with apple from heat; stir in 1 TBSP butter (2 TBSP for 4 servings) and a squeeze of lemon juice. Divide pork, zucchini, and sweet potatoes between plates. Top pork with glazed apple sauce. Top zucchini with a squeeze of lemon juice.
