The jumbo tenderloin sandwich is a Midwestern American classic, most famously associated with Indiana. It features a thin, pounded pork tenderloin that is breaded, fried until golden, and served on a bun so small it barely contains the meat. This recipe delivers a genuinely oversized, crispy, and juicy sandwich that is perfect for a hearty meal.
Ingredients
- 1 ½ lb (680 g) pork tenderloin, trimmed of silver skin
- 1 cup (240 ml) buttermilk
- 2 large eggs
- 2 cups (240 g) all-purpose flour
- 1 tsp (5 g) salt, plus more for seasoning
- 1 tsp (2 g) black pepper, plus more for seasoning
- 1 tsp (2 g) paprika
- ½ tsp (1 g) garlic powder
- ½ tsp (1 g) cayenne pepper (optional, for heat)
- Vegetable oil, for frying (about 2 cups / 480 ml)
- 4 large hamburger buns, split and toasted
- Pickles, sliced, for serving
- Yellow mustard, for serving
- Onions, thinly sliced (optional)
- Tomato slices (optional)
- Lettuce leaves (optional)
Instructions
- Pound the pork: Cut the pork tenderloin crosswise into 4 equal pieces. Place each piece between two sheets of plastic wrap or wax paper. Using a meat mallet or rolling pin, pound each piece to an even thickness of about ¼ inch (6 mm). The pieces will become large and thin—this is the key to the jumbo effect.
- Marinate: In a shallow dish, whisk together buttermilk, eggs, salt, and pepper. Add the pounded pork pieces, turning to coat. Cover and refrigerate for at least 30 minutes, or up to 4 hours for more flavor.
- Prepare breading: In a separate shallow dish, combine flour, paprika, garlic powder, and cayenne (if using). Season generously with salt and pepper.
- Bread the pork: Remove a pork piece from the buttermilk mixture, letting excess drip off. Dredge it in the seasoned flour, pressing firmly so the coating adheres. Shake off excess and set on a wire rack. Repeat with all pieces.
- Heat oil: In a large, deep skillet or Dutch oven, pour in about ½ inch (1.25 cm) of vegetable oil. Heat over medium-high until a pinch of flour sizzles immediately (about 350°F / 175°C).
- Fry the pork: Carefully lay one or two breaded pork pieces in the hot oil (do not overcrowd). Fry for 3–4 minutes per side, until golden brown and crispy. The internal temperature should reach 145°F (63°C) as the safe minimum for whole cuts of pork, checked with a food thermometer. Transfer to a paper towel-lined plate. Repeat with remaining pieces.
- Assemble: Place a fried tenderloin on the bottom half of each toasted bun. The meat will overhang the bun dramatically. Top with pickles, mustard, and any other desired toppings. Place the top bun on top, pressing down gently.
Tips
- Pound evenly: Uneven thickness means uneven cooking—the thin parts will overcook before the thick parts are done. Aim for uniform ¼-inch thickness.
- Don’t skip the marinate: Buttermilk tenderizes the pork and adds tang. Even 30 minutes makes a difference; longer is better.
- Oil temperature: If the oil is too hot, the coating burns before the pork cooks; too cool, and the pork absorbs oil and becomes greasy. Use a thermometer if you have one.
- Substitutions: No buttermilk? Mix 1 cup milk with 1 tablespoon lemon juice or vinegar and let sit 5 minutes. For a gluten-free version, use cornstarch or a gluten-free flour blend.
Serving Suggestions
Serve the jumbo tenderloin sandwich immediately, while the coating is crisp. Classic sides include french fries, onion rings, coleslaw, or a simple green salad. It’s also great with extra pickles and a cold drink.
Variations
- Spicy: Add more cayenne to the flour or a drizzle of hot sauce in the buttermilk.
- Cheesy: Place a slice of American or cheddar cheese on the hot pork just after frying, letting it melt.
- Chicken: Substitute boneless, skinless chicken breast, pounded thin. Cook to 165°F (74°C).
- Grilled: Skip the breading and grill the pounded pork over high heat for 2–3 minutes per side.
Storage and Reheating
Refrigerate leftover fried pork in an airtight container for up to 3–4 days. To reheat, place on a baking sheet in a 375°F (190°C) oven for 10–12 minutes, until hot and crisp. Avoid microwaving, as it makes the coating soggy. The assembled sandwich is best eaten fresh; store components separately if possible.
Frequently Asked Questions
Can I use pork loin instead of tenderloin? Yes, pork loin works but is leaner and can dry out more easily. Pound it thin and do not overcook.
How do I get the coating to stay on? Make sure the pork is well-coated in flour and press firmly. Let the breaded pieces rest for 10 minutes before frying—this helps the coating adhere.
Can I bake instead of fry? Yes, place breaded pork on a greased baking sheet and bake at 425°F (220°C) for 15–20 minutes, flipping halfway. It won’t be as crispy, but it’s lower in fat.
What if I don’t have a meat mallet? Use a rolling pin, a heavy skillet, or even a wine bottle. Just make sure the pork is evenly thin.
Can I prepare these ahead? You can pound and marinate the pork up to 4 hours ahead. Bread and fry just before serving for best texture.
Is the sandwich really eaten with a knife and fork? Traditionally, it’s eaten with your hands, but the overhanging meat often makes that messy. Many people cut it in half or just fold the edges over the bun.
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Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes
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