A 70/30 beef patty brings a high volume of fat to the pan. That fat bastes the meat from the inside as it cooks, but it also dictates how you manage the heat. You need an intense surface temperature to build a thick, brittle crust before the center of the patty overcooks. A cast iron skillet handles this requirement perfectly. It gives you a dark, even sear instead of steaming the cast iron burger recipe in its own juices. The resulting sandwich is heavy and rich, requiring sharp acid and sturdy bread to hold the build together.
Building the Bacon Onion Fig Jam
Sweet ingredients on a savory sandwich need a deep, grounded anchor. Here, it comes from rendered pork fat. Start the chopped bacon in a cold skillet. A cold start allows the solid fat to slowly melt out before the edges of the meat crisp up. Once the bacon turns brittle, take it out with a slotted spoon. Leave the rendered fat in the pan to cook the diced yellow onions.
Keep the heat at medium low. If you rush the onions with high heat, they will burn before their structure breaks down and their natural sugars develop. Stir them until they collapse into a dark mahogany paste. At that point, stir in the chopped figs, brown sugar, balsamic vinegar, and fresh thyme. Let the pan simmer gently until all of the residual moisture evaporates and you are left with a dense, sticky bacon onion fig jam. Stir the crisp bacon back in at the end so it retains some texture and does not dissolve into the spread.
Mixing the Chipotle Mayo Burger Sauce
With rich meat and sweet jam, the sandwich needs a sharp, acidic component to cut through the heavy build. Mayonnaise gives you a stable, rich base, but we thin it and sharpen it with fresh lemon juice and Dijon mustard. Ground chipotle powder brings a dry, smoky heat, while a small measure of honey rounds out the aggressive bite of the mustard. Mix this chipotle mayo burger sauce early and leave it in the refrigerator. The dry chipotle powder needs time to hydrate in the moisture of the mayonnaise so the heat distributes evenly rather than remaining gritty on the palate.
Searing the Portobello and 70/30 Beef Patty
Portobello mushrooms hold a significant volume of water. You have to drive that moisture out to concentrate their earthy flavor. Heat avocado oil in the skillet. You need an oil with a high smoke point for this application. Season the caps heavily with the cumin and paprika spice blend, then place them gill side up. As the heat hits the mushroom, its structure softens, the water steams off, and the edges take on a dark sear. Pull them from the pan.
Add a little more oil, and get it smoking hot. We use a 70/30 beef patty here because a heavy cast iron sear demands fat. If you use a leaner blend, the intense heat will dry out the meat before a proper crust can form. With 70/30, the extra fat melts rapidly into the pan. The patty essentially fries in its own rendered tallow, building a dark, brittle crust on the iron while leaving enough moisture trapped inside to keep the center intact.
After the flip, the cooking moves fast. In the final minute, drape a slice of white American cheese over the meat. If you cover the pan for a few seconds, the trapped steam will force the cheese to melt rapidly, draping over the uneven edges of the crust.
The Final Assembly
A standard soft bun will disintegrate under this volume of fat and jam. Ciabatta has an open crumb and a sturdy, thick crust capable of absorbing the wet ingredients without dissolving.
Toast the sliced rolls face down in the skillet. Spread the spicy burger sauce on both halves, then layer the peppery arugula on the bottom bun to catch the drippings from the beef. Stack the cheese covered beef, the seared portobello cap, and a heavy spoonful of the warm fig relish.
Put the entire crowned sandwich back into the skillet over medium low heat. Press down firmly with a stiff spatula. This final step applies direct heat to the outside of the ciabatta, compresses the individual layers together, and turns the disparate parts into one cohesive seared portobello beef burger. Serve it immediately while the bread remains crisp.
Portobello and Beef Ciabatta Smash Burger with Bacon-Onion Fig Jam
4
servings20
minutes45
minutes1
hour5
minutesA cast-iron-seared 70/30 beef patty and a browned portobello mushroom cap sit beneath a layer of reduced bacon-onion-fig jam. The build is bound together with melted white American cheese and a smoky chipotle mayo before a final press in the hot skillet crisps the ciabatta exterior.
Keeps the screen of your device on while you cook
Ingredients
- For the Bacon-Onion Fig Jam:
6 strips bacon, chopped
3 yellow onions, diced
4 fresh figs, stemmed and chopped
1 tablespoon brown sugar
1 tablespoon balsamic vinegar
1 sprig thyme
pinch of salt
pinch of ground black pepper
- For the Burger
1 pound ground beef (70/30), formed into patties
2 large portobello mushroom caps, stems removed
2 tablespoons avocado oil
2 ciabatta rolls, sliced
2 slices white American cheese
1 handful arugula
- For the Chipotle Mayo:
1/2 cup mayonnaise
1 teaspoon ground chipotle powder
1 lemon, juiced
1 teaspoon Dijon mustard
1 teaspoon honey
pinch of salt
- For the Spice Mixture:
1 teaspoon salt
1 teaspoon ground black pepper
1 teaspoon ground white pepper
1 teaspoon ground cumin
1 teaspoon smoked paprika
1 teaspoon onion powder
Directions
- Mix the Chipotle Mayo:
- In a small bowl, whisk together the mayonnaise, ground chipotle powder, freshly squeezed lemon juice, Dijon mustard, honey, and salt. Stir until smooth and well incorporated. Cover and refrigerate until ready for use.
- Simmer the Jam:
- Place the chopped bacon in a cold skillet and turn the heat to medium. Cook until the fat renders and the bacon is crisp, 6 to 8 minutes. Remove the bacon with a slotted spoon and set aside. Drain all but 2 tablespoons of the bacon fat from the pan.
- Add the diced yellow onions and cook over medium-low heat until deeply caramelized and soft, 15 to 20 minutes. Stir in the chopped figs, brown sugar, balsamic vinegar, thyme, salt, and ground black pepper. Let the mixture simmer gently until the figs break down and the mixture becomes thick and sticky, another 10 to 15 minutes. If the mixture becomes too dry, add a splash of water as you see fit. Remove from heat and stir the crispy bacon back in.
- Sear the Portobello Mushrooms:
- In a heavy cast-iron skillet, heat 1 tablespoon of avocado oil over medium-high heat. Season the portobello caps with a sprinkle of the spice mixture. Place them gill-side up in the pan and cook for 4 to 5 minutes, until deeply browned. Flip and cook for another 3 to 4 minutes until tender. Remove and set aside.
- Cook the Patties:
- Crank the heat up on the cast-iron skillet, add the remaining tablespoon of avocado oil. Season the beef patties generously on both sides with the spice blend. Sear for 4 to 5 minutes on the first side to develop a dark, crusty char. Flip and cook for another 3 to 4 minutes. In the final minute of cooking, drape a slice of white American cheese over each patty and cover the skillet briefly until the cheese melts into a smooth, glossy layer. Let the patties rest for a minute off the heat.
- Toast and Assemble:
- Toast the sliced ciabatta rolls in a dry skillet or under the broiler until golden and crisp. Spread a generous layer of the chipotle mayo on both the top and bottom buns. Pile fresh arugula on the bottom bun. Add the cheese-covered beef patty, stack the seared portobello mushroom on top, and finish with a heavy spoonful of the warm bacon-onion fig jam. Crown with the top bun and return to the skillet. Press down gently but firmly with your spatula or a burger press, and toast for 1 minute per side. Serve immediately.
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Frequently Asked Questions
Why start the bacon in a cold pan for the bacon onion fig jam?
Starting in a cold pan gives the solid pork fat time to melt before the meat crisps. If you drop bacon into a hot skillet, the outside sears immediately, trapping the fat inside and giving you chewy pieces instead of crisp bits.
Why use a 70/30 beef patty for this cast iron burger recipe?
A 70/30 blend brings enough fat to baste the meat from the inside as it cooks over high heat. That extra fat is what allows you to build a dark, hard crust in the skillet without drying out the center of the patty.
Why press the assembled seared portobello beef burger in the skillet?
Pressing the fully built sandwich applies direct heat to the outside of the ciabatta while physically compressing the layers. It binds the melted cheese, the thick mushroom cap, and the beef together so the tall structure doesn’t slide apart when you pick it up.
Why add balsamic vinegar to the simmering figs?
The vinegar provides necessary acidity to cut through the heavy sweetness of the brown sugar and dried figs. The liquid also helps soften the tough fig skins so they can break down into a sticky paste.
Why let the chipotle mayo burger sauce sit in the fridge before serving?
The dry chipotle powder needs time to hydrate in the moisture from the mayonnaise and lemon juice. Giving it time to sit ensures the smoky heat distributes evenly through the sauce instead of remaining gritty.
