The Flying Dutchman has achieved legendary status as the ultimate “secret menu” hack, and for good reason. By ditching the bread and sandwiching juicy beef between thick, deeply caramelized onion rounds, you create a burger that is naturally gluten-free and exploding with savory sweetness. The secret to this specific version is the Creole-infused sauce and a hint of brown sugar on the onions, which helps them achieve that dark, jammy crust that holds the burger together. It’s messy, indulgent, and undeniably delicious.
Prep Time: 10 min | Cook Time: 20 min | Total Time: 30 min
Key Ingredients
The “Onion Buns”
- Onion: 1 large yellow onion (sliced into four 1/2-inch thick rounds).
- Glaze: 2 tbsp olive oil, 1 tbsp Worcestershire sauce, 1/2 tsp brown sugar.
- Seasoning: 1/2 tsp Tony Chachere’s (Creole seasoning).
The Patties
- Beef: 12 oz 80/20 ground beef (the fat ratio is key for a juicy sear).
- Seasoning: 1/2 tbsp Tony Chachere’s.
- Cheese: 4 slices American cheese (classic for that perfect melt).
The Signature Sauce
- The Base: 1/2 cup mayonnaise, 2 tbsp relish, 1 tbsp Dijon mustard.
- The Kick: 1 tbsp Worcestershire, 1 tsp each of garlic powder, onion powder, smoked paprika, and Tony Chachere’s.
- Sweet & Heat: 1 tsp sugar and cayenne pepper to taste.
Step-by-Step Instructions
- Caramelize the “Buns”: Drizzle your thick onion slices with olive oil, Worcestershire, seasoning, and brown sugar. In a pan over medium-low heat, cook them for 10 minutes per side.Note: Take your time here. You want them tender all the way through and deeply browned, but still intact enough to act as a bun.
- Smash the Patties: Season your beef and form into four balls. In a hot pan over medium-high heat, smash them down thin. Sear for 2–3 minutes until a dark, crispy crust forms.
- The Cheese Melt: Flip the patties and immediately top each with a slice of American cheese. Let it drape over the sides until fully melted.
- Whisk the Sauce: While the meat cooks, whisk all sauce ingredients in a small bowl. Adjust the cayenne until the “zing” is exactly where you want it.
- Assemble: Place one caramelized onion round on a plate. Top with a cheesy patty, a generous dollop of sauce, and a second onion round.
- Serve: Serve immediately while the cheese is gooey and the onions are warm.
Tips & Tricks for Success
- Be Gentle: Caramelized onions are delicate. Use a wide, thin spatula to flip them so they don’t separate into individual rings.
- The “Smash” Factor: Pressing the beef thin allows for more surface area to brown, which creates that classic “diner-style” flavor.
- Keto Swap: To make this strictly Keto, replace the sugar in the sauce and the brown sugar on the onions with a monk fruit or erythritol sweetener.
Serving Suggestions
- Freshness: Since this burger is very rich, serve it with a side of cold pickles or a crisp wedge salad to cut through the fat.
- Dipping: Always keep a small ramekin of extra sauce on the side—you’re going to want it for every bite.
- Classic Pairing: Pairs perfectly with air-fried zucchini fries or jicama sticks for a low-carb “fries and burger” experience.
Nutrition Information (Per Burger)
| Calories | Protein | Fat | Net Carbs | Sugar | Sodium |
| 520 | 29g | 40g | 11g | 5g | 1180mg |
Disclaimer: Nutrition information is an estimate. Creole seasoning can be high in salt; adjust based on your dietary needs.
