Combine the sweet pickle relish and mayonnaise together in a small bowl (if using). Set aside.
Lay a piece of flatbread on a plate or clean work surface. Slather with one quarter of the warm mashed potatoes and sprinkle crispy fried onions over the top.
Place a hot dog on top of the mashed potato layer. Drizzle with ketchup and mustard.
Spoon one quarter of the skagenröra or the relish-mayo mixture next to the hot dog.
Top with a handful of greens and another sprinkle of crispy fried onions. Serve immediately.
- I serve mine flat on the plate and don't try to roll it up until I'm ready to eat to prevent the tunnbröd from getting soggy and falling apart.
- You might consider a knife and fork along side this one. It's messy (in a good way!)
- When serving this dish to guests, it's easiest to give them a tutorial, lay out the ingredients and let them assemble their own.
Calories: 531kcal | Carbohydrates: 66g | Protein: 14g | Fat: 24g | Saturated Fat: 4g | Polyunsaturated Fat: 13g | Monounsaturated Fat: 5g | Trans Fat: 0.1g | Cholesterol: 12mg | Sodium: 1124mg | Potassium: 545mg | Fiber: 5g | Sugar: 14g | Vitamin A: 396IU | Vitamin C: 37mg | Calcium: 59mg | Iron: 4mg