Step 1: Prepare the Meat Mixture

• Preheat your oven to 180°C (350°F).
• In a large mixing bowl, combine minced meat, eggs, chopped onion, minced garlic, parsley, paprika, salt, and pepper.
• Mix well until all the ingredients are evenly combined.

Step 2: Cook the Spinach and Mushrooms

• Heat a drizzle of olive oil in a skillet over medium heat.
• Add the spinach and cook until wilted. Remove and set aside.
• In the same skillet, sauté the mushrooms until golden brown. Remove and set aside with the spinach.

Step 3: Assemble the Gratin

• In a greased baking dish, spread an even layer of the meat mixture.
• Top the meat with the cooked spinach and mushrooms.
• Sprinkle grated cheese generously over the vegetables to form a gooey top layer.

Step 4: Prepare the Mushroom Sauce

• Heat olive oil in a saucepan over low heat.
• Add soy sauce, tomato paste, mustard, honey, chopped pickles, diced tomatoes, walnuts, and minced garlic.
• Stir continuously until the sauce thickens slightly and the ingredients are well incorporated. Taste and adjust the seasoning if needed.

Step 5: Bake the Gratin

• Pour the prepared mushroom sauce over the cheese layer in the baking dish.
• Cover the dish with aluminum foil and bake for 30 minutes.
• Remove the foil and bake for an additional 10-15 minutes until the top is golden and bubbly.

Step 6: Serve and Enjoy

• Once baked, let the gratin rest for 5-10 minutes before serving.
• Garnish with fresh parsley for added flavor and color.
• Serve hot and enjoy this savory, satisfying dish!