Peel and finely dice the onions and garlic. Heat the oil in a pan and fry the minced meat for about 10 minutes until coarsely crumbly. After about 6 minutes add onion and garlic. Dust with flour. Add stock and milk while stirring. Bring to the boil and simmer for about 10 minutes.
Wash and halve the tomatoes. Prepare the puree according to the instructions on the packet. Season Bolo with marjoram, salt and pepper. Add tomatoes and braise for another 3 minutes. Arrange puree and Bolo and sprinkle with fried onions.