Peel and cut potatoes in large chunks. Place in a pot with water and some salt. Bring to a boil, cover and cook until tender.
While the potatoes cook, heat olive oil in a pan at medium-low heat. Add onion and cook for a few minutes, until it starts to get translucent.
Add garlic and ají panca, cook for another 5-10 minutes until very soft, stirring often.
Raise heat to medium-high, add mince and cook until completely browned.
Season with salt, pepper and cumin. Add sultanas and turn off the heat.
Preheat oven at moderate temperature.
Mash the potatoes, season with salt and pepper. Whisk egg and mix with mash.
Layer beef mixture in a roasting pan. Scatter olive and boiled egg pieces evenly. Top with mash and spread evenly.
Bake until the top is golden brown, about 20-30 minutes.
Slice and serve with salsa criolla and salad.