For the puree, peel and wash the turnip, carrots and potatoes and cut them into cubes. Put stock, potatoes and vegetables in a pot. Bring to the boil and simmer for about 20 minutes in a closed saucepan.
For the minced steaks, peel onions and garlic. Finely dice 1 onion and garlic. Knead minced meat, egg, onion and garlic cubes, sambal oelek, mustard and breadcrumbs. Season with 1 teaspoon of salt.
Shape the mince into 12 flat meatballs. Heat the oil in a pan. Fry the meatballs in portions for approx. 8 minutes, turning. Drain vegetables and potatoes. Heat milk and butter, add to the vegetables and mash to mush with a potato masher.
Season to taste with salt and pepper. Cut the remaining onion into rings and fry in the frying fat of the meatballs for about 4 minutes while turning. Arrange minced steaks, onion rings and puree on a plate.