Pof-e Talaei (پف طلایی) — Persian Golden Puff Potato Casserole

• 900 gRusset potatoes, peeled and cut into 3 cm chunks (Starchy potatoes pipe best and brown well)
• 10 gFine salt (Divided (for potatoes and filling))
• 90 gUnsalted butter (Cut into cubes, divided)
• 120 mlWhole milk (Warm, for smooth mash)
• 2 largeEgg yolks (For structure and glossy rosettes)
• 2 gGround black pepper (Freshly ground)
• 0.2 gSaffron threads (About 1/8 teaspoon)
• 30 mlHot water (Just off the boil)
• 30 mlNeutral oil (Such as sunflower or canola)
• 250 gYellow onion, finely diced (About 1 large onion)
• 120 gBell pepper, finely diced (Red or green; remove seeds and ribs)
• 300 gCremini mushrooms, finely chopped (Chop small so the filling slices cleanly)
• 450 gGround beef (15–20% fat) (Or a beef-lamb mix)
• 40 gTomato paste (About 2 tablespoons)
• 3 gGround turmeric (About 1 teaspoon)
• 3 gGarlic powder (About 1 teaspoon)
• 120 mlWater (To keep the filling moist while baking)

Instructions

1. 1

   Heat the oven to 200°C (390°F). Lightly grease a 23×33 cm (9×13 in) baking dish with 20 g butter. In a small cup, crush saffron threads and mix with 30 ml hot water; cover and steep 10 minutes to bloom color and aroma while you prep the filling.

2. 2

   Make the filling: warm 30 ml oil in a wide skillet over medium-high heat. Add onion and cook 6–8 minutes, stirring, until translucent with light golden edges. Add bell pepper and cook 3 minutes. Add mushrooms and cook 8–10 minutes until their liquid evaporates and the pan looks mostly dry.

3. 3

   Add ground meat to the skillet and break it up with a spoon. Cook 6–7 minutes until no pink remains and the meat begins to brown. Stir in turmeric, garlic powder, black pepper, and 5 g of the salt. Add tomato paste and cook 2 minutes, stirring, to caramelize it slightly.

4. 4

   Pour in 120 ml water and scrape the bottom of the pan to dissolve browned bits. Simmer 5 minutes until the mixture is saucy but not watery; it should mound on a spoon. Stir in 2 tablespoons (about 20 ml) of the bloomed saffron water, then spread the filling evenly in the prepared dish.

5. 5

   Cook the potatoes: place potato chunks in a pot and cover with cold water by 3–4 cm. Add the remaining 5 g salt. Bring to a boil, then simmer 15–18 minutes until very tender (a knife slides through easily). Drain well, then return to the hot pot 1 minute to steam off excess moisture.

6. 6

   Mash and enrich: pass potatoes through a ricer or mash until completely smooth. Stir in 90 g butter until melted, then mix in warm milk. Add egg yolks and the remaining saffron water (about 10 ml), plus pepper, and mix until glossy. Let the mash cool 5 minutes so it pipes cleanly.

7. 7

   Pipe the rosettes: transfer potato mixture to a piping bag fitted with a large star tip (about 1.3 cm / 1/2 in). Pipe tight rosettes over the filling, starting at the edges and working inward, covering the surface completely. For extra browning, brush the tops lightly with any butter left on the bowl.

8. 8

   Bake 25–30 minutes at 200°C (390°F) until the rosettes are deeply golden at the ridges. For a more dramatic finish, broil/grill on high for 1–3 minutes, watching constantly to prevent scorching. Rest 10 minutes before slicing so the layers set and serve neatly.