Stuffed Pork Tenderloin with Mustard-Caper Sauce
Peer reviewed by UK recipe editorsAuthored by UK recipe editorsOriginally published 16 Jan 2026
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This elegant stuffed pork tenderloin with mustard-caper sauce is a sophisticated high-protein dish that works beautifully as a light lunch or a refined picnic centrepiece. The lean pork is butterflied and filled with a savoury mixture of salty bacon, wilted spinach, and hard-boiled eggs, creating a beautiful mosaic effect when sliced. It is a fantastic way to elevate a simple cut of meat into something truly special for guests.
Prepared in advance and served cold or at room temperature, this recipe allows the flavours of the zesty, piquant caper sauce to really shine against the tender meat. Pairing the pork with a sharp, creamy dressing and some crusty bread makes for a balanced, satisfying meal that is as nutritious as it is flavourful. It is an excellent choice for those looking for a delicious, low-carbohydrate option that doesn't compromise on taste.
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Ingredients for Stuffed Pork Tenderloin with Mustard-Caper Sauce
2 bacon slices, cut crosswise into 1/4-inch strips
2 garlic cloves, finely chopped
140g spinach, coarse stems discarded, finely chopped
2 teaspoons coarse-grain mustard
1 (1-pound) pork tenderloin
1 hard-boiled egg, quartered lengthwise
1 tablespoon vegetable oil
2 hard-boiled eggs
45ml olive oil
2 tablespoons mayonnaise
1 tablespoon coarse-grain mustard
2 tablespoons fresh lemon juice
1 tablespoon drained capers,
Equipment: kitchen string
Accompaniment: crusty bread
How to make Stuffed Pork Tenderloin with Mustard-Caper Sauce
Cook bacon in a 12-inch heavy ovenproof skillet over medium heat, stirring occasionally, until fat is rendered and bacon is golden but not crisp.
Add garlic and cook, stirring occasionally, until pale golden, about 2 minutes. Add spinach and cook, turning with tongs, until wilted and tender, about 3 minutes. Toss spinach with mustard and 3/4 teaspoons each of salt and pepper in a bowl.
Arrange tenderloin on a work surface with pointed (thinner) end nearest you. Starting at top (thicker part), make a lengthwise incision down centre of tenderloin, cutting two thirds of the way through thickness of meat, adjusting depth of incision as tenderloin tapers (be careful not to cut all the way through). Open tenderloin. Turning knife horizontally, cut tenderloin open on either side like the flaps of a book jacket, being careful not to cut all the way through. Season inside of tenderloin with 3/4 teaspoons each of salt and pepper.
Turn tenderloin so that a long side is nearest you, then spread spinach filling evenly over opened tenderloin, leaving a 1-inch border along long edge farthest from you. Arrange egg quarters, end to end, along edge nearest you.
Preheat oven to 218°C with rack in middle.
Roll up tenderloin tightly, then tie with string at 1 1/2-inch intervals.
Pat tenderloin dry and season with 1/4 teaspoons salt and 3/4 teaspoons pepper.
Heat oil in cleaned skillet over high heat until it shimmers. Sear tenderloin, turning occasionally, until golden brown, 8 to 10 minutes. Transfer skillet to oven and roast until an instant-read thermometer inserted diagonally 2 inches into thickest part registers 66°C, 18 to 25 minutes.
Transfer tenderloin to a platter and cool completely, uncovered, about 30 minutes. Chill, covered, until cold, about 2 hours.
Force eggs through a fine-mesh sieve into a bowl, then stir in remaining sauce ingredients.
Cut off string, then thinly slice tenderloin. Serve pork, cold or at room temperature, with sauce.
Disclaimer
While every effort has been made to ensure the information is accurate and up to date, individual needs may vary and dietary requirements can differ based on personal health conditions. Always check food labels and allergen information before preparing or consuming any recipe. If you have specific health concerns, allergies, intolerances, or are following a medically prescribed diet, seek advice from your GP, pharmacist, or a registered dietitian before making significant changes to your diet or lifestyle.
Article history
The information on this page is peer reviewed by qualified clinicians.
16 Jan 2026 | Originally published
Authored by:
UK recipe editors
Peer reviewed by
UK recipe editors

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