Baked Lemon-Rosemary Pork Tenderloin with Garlic Mashed Potatoes

By AislePrompt Editorial · ·

How this recipe was made — this recipe was drafted by AislePrompt's AI-assisted pipeline from technique templates and USDA-sourced nutrition data, and published by AislePrompt Editorial — see how AislePrompt recipes are drafted and published.

Tender pork tenderloin roasted with fresh rosemary and lemon zest paired with creamy garlic mashed potatoes for a comforting dinner. This American-inspired pork recipe, ready in about 45 minutes, pairs pork tenderloin, kosher salt, black pepper for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 520 calories and feeds 3, so it slots cleanly into a weekly meal plan and pairs well with a quick salad or grain on the side. Tap "Plan a meal with the AI" below to drop this recipe into your week and send the ingredients straight to Instacart. Nutrition values are approximate, calculated from USDA FoodData Central (fdc.nal.usda.gov) — verify against ingredient labels for any health-driven dietary plan.

Prep: 10 min Cook: 35 min Serves 3 American cuisine 520 cal/serving
Build a week of meals around this recipe → Shop this recipe on Instacart → Shop equipment ↓

Ingredients

The instant-read thermometer we’d check this pork with → Best Instant-Read Thermometers for 2026: Fast, Accurate Picks Under $100

Affiliate disclosure: AislePrompt may earn a commission on qualifying purchases made through Amazon links, at no additional cost to you. See our policy →

Equipment for this recipe

Tools this recipe's steps call for, with a link to each on Amazon.

More Bakeware & baking tools → Shop all kitchen tools →

Instructions

  1. Step 1: Preheat oven to 400°F. Pat dry 1 lb pork tenderloin and season all sides with 1 tsp kosher salt, 1/2 tsp black pepper, 2 tbsp chopped fresh rosemary, and 1 tsp lemon zest. Drizzle with 1 tbsp olive oil and rub seasoning evenly.
  2. Step 2: Place pork on a rimmed baking sheet and roast for 20-25 minutes until internal temperature reaches 145°F. Remove from oven and let rest for 5 minutes before slicing.
  3. Step 3: While pork roasts, place 2 large peeled and quartered russet potatoes in a large pot and cover with cold water. Bring to a boil over high heat and cook until fork-tender, about 15 minutes. Drain well.
  4. Step 4: In the same pot, add 3 tbsp unsalted butter, 1/2 cup whole milk, and 3 minced garlic cloves over low heat until butter melts and garlic softens, about 2 minutes.
  5. Step 5: Return drained potatoes to the pot and mash with a potato masher until smooth and creamy, adding more milk if needed. Season with salt and pepper to taste.
  6. Step 6: Serve sliced pork tenderloin alongside the garlic mashed potatoes.

Related recipes