Pork Loin Roast · Garlic Mustard Herb

Garlic Mustard Herb Pork Loin Roast

A boneless pork loin coated in a garlicky mustard and herb paste and roasted until golden. It slices beautifully, feeds a crowd and makes great leftovers.

New, no ratings yet0 reviewsby Simmerbee Kitchen

Prep
15 min
Cook
1 hr 5 min
Total
1 hr 30 min
Serves
8
Level
Easy

Ingredients

  • 3 lb boneless pork loin roast, fat cap trimmed to 1/4 inch
  • 2 tsp kosher salt
    Swaps for kosher salt

    Instead of salt

    • Table salt or fine sea salt: About half as much as Diamond Crystal kosher, about ¾ as much as Morton kosher. The same saltiness when measured this way.
    • Salt by weight: 1 tsp is about 6 grams of table salt, 5 grams of Morton kosher, 3 grams of Diamond Crystal kosher. The most reliable way to swap, especially in baking and brines.

    More for salt

  • ½ tsp black pepper
  • 3 tbsp dijon mustard
    Swaps for dijon mustard

    Instead of mustard

    • Another prepared mustard: The same amount. Yellow is milder and more vinegary; Dijon is sharper; whole-grain adds texture; spicy brown is in between.
    • Dry mustard: 1 tsp dry mustard + 1 tsp water + 1 tsp white wine vinegar for each 1 tbsp. Sharper and less smooth.

    More for mustard

  • 2 tbsp olive oil
    Swaps for olive oil

    Instead of olive oil

    • Avocado oil or another neutral oil: The same amount. No olive flavor; avocado oil handles higher heat.
    • Butter: The same amount. Richer and nutty when browned.
    • A neutral oil + more seasoning: The same amount. Dressings lose the fruity, peppery note; a little extra lemon, garlic or mustard makes up for it.

    More for olive oil

  • 4 cloves garlic, minced
    Swaps for garlic

    Instead of garlic

    • Garlic powder: ⅛ tsp for each clove. Mellower and sweeter, with no bite.
    • Jarred minced garlic: ½ tsp for each clove. Milder and slightly sour from the preserving liquid.

    More for garlic

  • 1 tbsp fresh rosemary, finely chopped
    Swaps for fresh rosemary

    Instead of rosemary

    • Dried rosemary: 1 tsp dried for each 1 tbsp chopped fresh (a third as much). Strong and piney; the dried needles are sharp, so crush or chop them first.
    • Fresh thyme: The same amount. Milder and less piney.
    • Fresh sage: Half as much. Earthier and softer.

    More for rosemary

  • 1 tbsp fresh thyme leaves, chopped
    Swaps for fresh thyme leaves

    Instead of thyme

    • Dried thyme: 1 tsp dried for each 1 tbsp chopped fresh (a third as much). Earthier and a little less bright, but dried thyme holds up well in soups, stews and roasts.
    • Fresh oregano or marjoram: The same amount. Oregano is stronger; marjoram is sweeter and milder.
    • Fresh rosemary: Half as much. Piney and stronger.

    More for thyme

  • 1 tsp brown sugar
    Swaps for brown sugar

    Instead of brown sugar

    • White sugar + molasses: 1 cup granulated sugar + 1 tbsp molasses (light) or 2 tbsp (dark). The same as store-bought.
    • White sugar: The same amount. Crisper, paler cookies with less caramel flavor.
    • Light and dark brown sugar: The same amount, either way. Dark brown sugar tastes stronger and makes bakes a bit darker and moister.

    All 4 swaps for brown sugar

Cooking for a crowd? Pans, timing and salt for 12 to 50.

Missing something? Tap Swaps next to an ingredient, or see all substitutions.

Cook to 145°F inside (check with a thermometer).

Steps

  1. Heat the oven to 375°F with a rack in the middle.
    375°F
  2. Pat the pork dry and
    season (how to season to taste) Season to taste Add salt (and pepper or acid) bit by bit, tasting as you go, until the food tastes fully of itself. 1. Season meat and vegetables before cooking, holding the salt high so it falls evenly.2. Taste the dish near the end with a clean spoon.3. If it tastes flat, add a pinch of salt, stir and taste again.4. If it tastes heavy or dull, a squeeze of lemon or a splash of vinegar brightens it.5. Stop when another pinch wouldn't make it better. Done when: The flavors are clear and bright, not flat and not salty. Safety: Don't taste dishes that hold raw meat, poultry or eggs; season them by the recipe's amounts and adjust after cooking.How to season to taste: mistakes to avoid
    it all over with the salt and pepper.
  3. Stir the mustard, oil, garlic, rosemary, thyme and brown sugar into a paste.
  4. Set the pork fat side up on the rack in a roasting pan and spread the paste over the top and sides.
  5. Roast (how to roast) Roast Cook food uncovered in a hot oven so the outside browns while the inside cooks through. 1. Heat the oven fully before the food goes in, usually 400 to 450°F for vegetables.2. Toss vegetables with oil and salt; dry and season meat.3. Spread everything out on a sheet pan or in a roasting pan with room around each piece.4. Roast, turning vegetables once halfway, until browned at the edges.5. For meat, check the center with a thermometer. Done when: Vegetables are browned at the edges and tender in the middle; meat reaches its safe temperature. Safety: Use dry oven mitts (wet ones pass heat straight through) and tilt hot pans away from you to avoid the fat and steam.How to roast meat and vegetables: mistakes to avoid
    until the center reads 145°F (63°C). Start checking at 50 minutes.
    145°F⏱ Roast: 1 hr 5 min
  6. Move the pork to a cutting board, tent loosely with foil and
    rest (how to rest) Rest Leave cooked meat, baked goods or dough alone for a while before you cut, slice or shape it. 1. Move meat to a board or plate as soon as it is done (a few degrees shy of target for big roasts; it keeps rising).2. Tent it loosely with foil if the kitchen is cool.3. Rest steaks and chops 5 minutes, roasts 15 to 20, a turkey 30.4. For dough, cover it so it doesn't dry out while it relaxes. Done when: Meat juices stay in when you slice; dough rolls out without springing back. Safety: Rest at room temperature for under an hour, then refrigerate leftovers within 2 hours of cooking.How to rest meat and dough: mistakes to avoid
    it.
    ⏱ Rest: 10 min
  7. Slice (how to slice) Slice Cut food into flat pieces of the same thickness. 1. Give round food a flat side to sit on.2. Hold it with your fingertips curled under.3. Cut with long strokes, pushing the knife forward and down rather than straight down.4. Move your guiding hand back the same distance each time so every slice matches. Done when: The slices are even. For meat, slicing across the grain (across the lines of muscle) gives the tenderest bite. Safety: Keep the fingertips of your guiding hand curled under, knuckles toward the blade, and set the board on a damp towel so it can't slide. Slice hot roasts on a board with a groove for the juices.How to slice evenly: mistakes to avoid
    the roast about 1/2 inch thick and spoon any pan juices over the slices.

Tap an underlined word for how to do it, or see all techniques.

Tips

  • The USDA safe temperature for whole cuts of pork is 145°F (63°C) followed by a 3-minute rest. A little blush of pink inside is fine.
  • Pork loin and pork tenderloin are different cuts; a tenderloin is much smaller and cooks in about 20 minutes.
  • Use a separate cutting board for raw meat, and wash hands, boards and knives in hot soapy water after handling it.

Storage

Refrigerate in an airtight container within 2 hours, up to 4 days. Slice cold for sandwiches, or warm slices gently in a covered pan with a splash of broth.

Make ahead

Rub the paste on, cover and refrigerate up to 24 hours. Let the roast sit out 30 minutes before roasting.

Quick answers

Can I make it ahead?

Let the roast sit out 30 minutes before roasting.

What can I swap?
  • Instead of mustard: Another prepared mustard, the same amount.
  • Instead of olive oil: Avocado oil or another neutral oil, the same amount.

Answered from this recipe's own storage, make-ahead and swap notes.

Estimated nutrition per serving

Calories
380
Protein
34 g
Carbohydrates
2 g
Fiber
0 g
Sugars
<1 g
Fat
25 g
Saturated fat
8 g
Sodium
590 mg

Whole recipe, 8 servings: about 3,000 calories.

Estimate from USDA FoodData Central; not medical or dietary advice. Based on 9 of 9 ingredients.

How we estimate

We add up USDA FoodData Central values for each measured ingredient as written and divide by the recipe's 8 servings, so changing the servings or units here doesn't change a serving. Brands, swaps, trimming and cooking all change the real numbers.

Estimated cost

About $1.80 a serving

About $14.50 for the recipe as written (8 servings).

Estimate; prices vary by store and region. U.S. average prices for September 2026 from BLS Average Price Data and USDA ERS Purchase to Plate prices updated with the BLS Consumer Price Index. Priced: 5 of 9 ingredients, 99% by weight.

How we estimate

Each measured ingredient is weighed as in the nutrition estimate and priced at the U.S. average: BLS's average price where BLS publishes one, else USDA ERS's Purchase to Plate price for 2017-18 raised to September 2026 with the CPI for that food group. Whole packages, store brands, sales and regions all change the real cost: treat it as a ballpark.

  • boneless pork loin roast $13.75 BLS
  • olive oil $0.40 ERS
  • dijon mustard $0.30 ERS
  • garlic $0.15 ERS
  • brown sugar $0.05 ERS

Not priced (no official average price we can match, so not in the total): kosher salt, black pepper, fresh rosemary, fresh thyme leaves.

More dishes for less: cheap eats.

Goes well with

Picked by our pairing rules: the same kind of kitchen, room in the oven and on the stove, ready in time, and a balance of starch, vegetables and richness.

  • Side Sweet Potato and Scallion Latkes 55 min Cooks on the stove while the pork loin roast is in the oven. Ready in 55 min, inside the main's 1 hr 30 min. Brings the starch the pork loin roast doesn't have.
  • Side Southern-Style Collard Greens 2 hr 10 min Cooks on the stove while the pork loin roast is in the oven. Make it ahead: it keeps. Brings the vegetables the pork loin roast doesn't have.
  • Dessert Buttery Jam Thumbprint Cookies 1 hr 40 min Make it ahead, so it's ready when dinner is.

See it as a complete dinner menu

Keep this one

Sign in to save recipes into your own collections, log the days you cook them and keep private notes, like "use less sugar next time". Only you see them.

Sign in to saveNo password: we email you a code.

Gear for this recipe

As an Amazon Associate we earn from qualifying purchases. Brands are suggestions; any similar item works.

Cleanup score 4/5 (easy cleanup): 2 things to wash, roasting pan, mixing bowl.

More kitchen gear and our gear guides

Reviews (0)

No reviews yet. Made it? Tell us how it went.