Preheat the oven to 200 degrees, let the country potatoes thaw. Wash the meat, pat dry and cut into larger pieces. Wash the tomatoes but leave them whole. Clean the spring onions and cut into 2 cm pieces.
Mix all ingredients in a large bowl, season with salt, pepper and chili powder. Put everything on a baking sheet and cook at 200 degrees for about 15 minutes. Turn and leave in the tube for another 15 minutes.