Instructions
Step 1: Preheat your oven to 200°C (180°C fan), or Gas Mark 6. Place the baguettes on a baking tray and bake them for 8 to 10 minutes until they develop a lovely crisp crust. Remove them from the oven and leave to cool slightly; this helps the bread hold its crunch once topped. Step 2: In a pan, gently heat 2 teaspoons of butter along with 1 teaspoon of vegetable oil over low heat. Add the chopped onion and cook slowly for about 5 minutes until it softens and becomes translucent—this slow cooking draws out the sweetness. Next, stir in the sliced mushrooms and turn the heat to medium. Continue cooking for 5 to 10 minutes until the mushrooms release their moisture and the liquid evaporates, leaving a rich, concentrated flavor. Add the finely chopped garlic and cook for an additional 1 to 2 minutes to infuse the mixture with its aromatic essence. Season with salt and pepper to taste, then stir in the mayonnaise to bind the filling and add creaminess. Remove the pan from the heat to prevent overcooking. Step 3: Slice the baguettes lengthwise in half. Place them cut-side up back on the baking tray. Evenly spread the mushroom mixture over each half. Next, sprinkle the cheddar cheese, diced ham, sliced Polish kabanos sausage, and shredded mozzarella over the top, layering in delicious waves of flavor. Bake for another 8 to 10 minutes until the cheese has melted into a golden, bubbly blanket. Step 4: While the zapiekanki bake, melt the remaining butter with the remaining vegetable oil in a clean pan over medium heat. Add the sliced onions and fry them gently for 5 minutes until they attain a beautiful golden color and tender softness—perfect for caramelized sweetness. Remove them from the heat and set aside. Once the baguettes are out of the oven, generously top them with the caramelized onions. Add dill pickles if desired for a touch of tang. Sprinkle freshly chopped chives and dill over the top to brighten the flavors. Finally, drizzle a zig-zag of tomato ketchup for that classic Polish street food finishing touch. Tip: For extra crispiness, press the baguettes down gently before baking. Also, feel free to experiment with other cheeses or add a pinch of smoked paprika to the mushroom mixture for a smoky depth.